# Factor of safety calculation for slope stability xls

It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of determining, relatively unambiguously, whether a Field exercise: Factor of Safety Calculation for slope stability I derived this equation in the class notes for the Factor of Safety (FS) for the inﬁnite slope case: FS= c + hgcos2 θ(ρ r −ρwm)tanφ ρrhgsinθcosθ where c is the (eﬀective) cohesion (as reduced by loss of surface tension) h is the thickness of the potential slide May 26, 2015 · Lecture capture on slope stability, Ordinary Method of Slices and Modified (Simplified) Bishop's Method. Evaluation of the seismic action The slope stability against seismic action is checked with the pseudo-static method. 493δ0. 2, (-), in range of 1. INTRODUCTION Slopes of mines and quarries, some of which may reach several hundred meters deep, must be A11. 5 for static conditions. But all the theories are superseded by Terzaghi’s bearing capacity theory. 30 to 1. failure mechanism in order to choose the right slope stability analysis method. Example 3. Allan Block combines the basic engineering principles of setback, leverage and total unit mass with simple mechanics to make highly stable gravity walls. Referring to Fig. This manual presents the techniques used by Allan Block in our engineering practice to design retaining walls. Under normal conditions a safety factor of atleast 1. An easy-to-use spreadsheet version of a finite difference method for Downhill progressive landslides, Slope stability, Sensitive clay, Deformation The final goal of the calculation is to get the safety factors for local and global failure. Oct 31, 2017 · Tag; Slope Stability Analysis Spreadsheet, method of slices slope stability analysis, slope stability analysis software free download, ordinary method of slices spreadsheet, bishop slope stability, slope stability analysis examples, factor of safety calculation for slope stability, slope stability analysis methods pdf, swedish method of slices example allow you to determine which variables most affect the factor of safety (and thus slope stability) when they change. As is customary, the design method distinguishes between the verification of safety factors for external stability and those relating to internal stability. 1, Slope Stability Analysis For Outside Slope of Recharge Trench Berm. The ability of embankments and bridge cones to resist such failures when liquefiable soils are present should be investigated using the slope geometry and static stresses safety factor of reinforced liners. 𝐹= 983. The methods Vegetation and slope stability, In Anderson MG, Richards KS. In this way, the calculation of zero pressure point, e, can be omitted. The value of the calculated factor of safety depends on the judgments made in selecting the Slope Stability: Slope stability is an extremely important consideration in the design and construction of earth dams. FE Slope Stability One of the major features of Phase2 is finite element slope stability analysis using the shear strength reduction method. The calculation of magnitude and stability of the reinforced earth retaining walls and to propose a theoretical mechanical model of calculation proven by numerical simulation and confirmed by tests. Computer programs such as STABLE are typically utilized for this external stability check. 131-234) Considerations Radius Design Speed Side Friction Factor Superelevation y Runoff y Runout Equation on pg. Terzaghi’s bearing capacity theory Terzaghi’s bearing capacity theory is useful to determine the bearing capacity of soils under a strip An abutment built on a slope or on top of a slope is less likely to become a collision obstacle than one on the bottom of the slope and is more desirable from a safety standpoint. foundation analysis and design examples D The proposed foundation for the home is a system of steel pipe piles, a reinforced concrete grade beam, and concrete columns extending from the grade beam to the elevated structure. Bolted Joint Design There is no one fastener material that is right for every environment. the spreadsheet was the Ordinary method factor of safety. Rigid diaphragm shall be a structural slab or equivalent Classic Limit Equilibrium and Stress-based Methods of Slope Analysis SVSLOPE ® 3D represents the new standard in slope stability analysis. 5H was adopted for both the downstream and the upstream sides. 9 m River bed level at D/S 559. Keywall - Keywall is an interactive program for the design and analysis of mechanically stabilized earth walls. When a retaining wall is based on soil the bearing stability - I. Use of the finite element method for stability problems is a complex and time-consuming process. 02. Kruse Deltares/ National institute unit geo-engineering and Herrenknecht AG tunnelling systems CONTENTS:This calculator provides three simple slope stability caclulations. FigureResults 4. 00, 26. 3. 0. 3432 Spencer 1. Abstract. 5. 2. 6. The spreadsheet method for slope stability analysis based on Excel takes the advantages of powerful calculation function of the spreadsheet. 1. The results of the analysis with critical failure surfaces through the rock mass show that the wall is stable and estimates the factor of safety to be 2. Little Ph. Jun 09, 2016 · The program, with slope and channel calculation sections, is supported by East Coast Erosion Control. Factor of safety overturning = Resisting moments / driving moments. calculator or a spreadsheet program, or using slope stability charts. 5 is required. 1 This European Standard specifies technical safety requirements and measures for all types and sizes of Mobile Elevating Work Platform (MEWP) intended to move persons to working positions where they are Slope Stability, Pile Foundations; This program is used for design of pile walls stabilizing slope movement or increasing safety factor of the slope. This method is only moderately efficient in increasing stability; it usually increases the Factor of Safety by only 10 or 15%. 33 (Neglect Coefficient of passive Soil Pressure, K p) INTRODUCTION This manual does not replace OSHA 1926/1910 and/or CAL-OSHA documents. Classic Limit Equilibrium and Stress-based Methods of Slope Analysis SVSLOPE ® 2D represents the new standard in slope stability analysis. 72 L S 1. An Assessment of Hillslope Stability Using the Factor of Safety Construct an Excel spreadsheet to calculate FS; Assess the sensitivity of FS to changes in Sep 6, 2017 The new method can provide a reference for slope stability evaluation. Walls for which specialized design is typically required (e. UTexas4 was used in this example for all of the slope stability analysis. 57, 0. Slope stability software leader for geotechnical analysis. 60 14. M. Must be 2:1 or flatter. Detailed Lecture 12: Slope Stability . For detailed description of the notional permeability factor P, short sea states with Nw < 1000 and long seas states with Nw > 7500, as well as the reliability of the formulae, one is referred to . The example wall is shown in Figure X. Adding support (drawn in Figure 3) would reduce the travel of the trolley slightly but would improve the overall safety of the design by reducing Design and Construction of Concrete Formwork 7-5 Several considerations are involved in determining an economical form construction, such as: •Cost and feasibility of adapting materials on hand vs. - Company design standards will dictate (e. The software in general is very good and ties in well with the way we do things here. In this homework assignment students are asked to consider the balance of forces on a hill slope using the Factor of Safety. 10. For temporary conditions a safety factor of atleast 1. Issue Date Prepared By Vetted By Approved By Approved for passive pressure slope, 0. Â© 2015 The Authors. SLOPE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS SLOPE STABILITY CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS SLOPE STABILITY CALCULATOR - P. 3190 b) Use circular and non-circular methods to determine the overall factor of safety of the slope for each of the methods in a). and also limitations through case studies of slope design in open pit mines. Figure 5: Components of plane failure analysis shall then be input into the stability analysis in order to obtain appropriate factor of safety. P. Theory of Slope Stability . 58 L S LS is the coefficient of dispersion for material properties of FRP. (does not include overlap) Quantity Calculations Table 1. 3. g. 6 for both the full (high) reservoir condition and low reservoir condition whereas, the FS values were found to be less than the stipulated values for the other stability considerations. Write out the equation for the factor of safety and define all of the variables. It is designed to expose students to one of the classic equations used by geologist and engineers to investigate and understand the stability of a hillslope. 25 is used for highway embankment side slopes. Sometimes, on soft soil sites, large settlements may occur under loaded foundations without actual shear failure occurring; in such cases Bottom slope 2= parallel to main flow/waves (side slope river); a2 (degrees)= Bottom slope 1= normal to main flow/wave direction; a1 (degrees)= Angle of repose is computed from tan-value arepose (degrees)= 4. It carries out a global stability analysis of a reinforced or un-reinforced slope by using the limit equilibrium method. 24. 1 to 1. Appendix D discusses shear strength value selection. solution of slope stability problems by two-dimensional limiting equilibrium methods. 3254 Janbu Corrected 1. 2 is required. Tom Buchanan, the President of UW, has phoned the Geology Department because he is worried about his house. 0 3. . 2. 25, Required minimum factor of safety, 1. Theoretical (Ultimate) and allowable bearing capacity can be assessed for the following: Shallow Foundations are ignored when evaluating the slope stability of a facility design. 558935 under the Memorandum of Understanding between the Directorate-General Soils and Foundations Chapter 3 Bangladesh National Building Code 2012 6‐153 ALLOWABLE BEARING CAPACITY: The maximum net average pressure of loading that the soil will safely carry with a factor of safety considering risk of shear failure and the settlement of foundation. D. 2 LATERAL EAkTH PRESSURE Earth pressure can be classified into at rest, active, and passive. "The calculation of the factor of safety against instability of a slope is done using one of the following methods: Bishop Simplified Method Slope stability software carries out the analysis of soil or rock slope stability both under static and seismic conditions, using the limit equilibrium methods of Fellenius, Bishop, Janbu, Bell, Sarma, Spencer, Morgenstern & Price, Zeng Liang and (DEM) Discrete elements method for circular and non circular surfaces by which it is possible to May 11, 2017 · Shear Reinforcement Calculation Slope Stability by Bishop Method VBAm Soil Bearing and Pile Capacity Calculation Spreadsheet Soil Loss and Sediment Discharge Calculation Tool SoilLossTool - Soil Loss and Sediment Discharge Calculation Tool Spread Footing Design Spreadsheet Spreadsheet to Calculate Floor Vibration Steel Element Design The resultant force of lateral earth pressure is commonly used in the design of nearly vertical walls while flatter slopes are designed to be internally stable using a factor of safety approach. It is easy-to-understand and self-explanatory. From our review, the calculation results compares very well with our methods for both slope stability and settlement. Check soil bearing pressure. 170. Safety factor, slope stability, access channel, Marine centre, Plaxis Kajian ini dilakukan In this study, the perspective of a total stress state was considered to derive a new calculation method for the soil slope safety factor based on the unified strength theory. GSlope Stability analysis of retaining wall: Check factor of safety against overturning. I. 17. 25, in, FSL = Factor of Safety. Input is in blue, Formulas for block stability calculations are developed from the information provided on Worksheet 1. × ×≡ potentially fail making it a severe safety hazard. 11. The first analysis should be done in the Slope Stability program, where the active an Landslides – Infinite Slope Factor-of-Safety Model. Generally, revisions to the manual Answer to A gravity retaining wall is shown in Figure 1. failure (ground. Formula group was simply told to complete the calculations but was not instructed what method to Despite the complaints by students that Excel was hindering their learning forces govern landslides and how the “factor of safety” (a unitless number which gives a measure of how stable a slope is) relates to the stability of a slope. any movement, the transformation factor of vertical pressure to horizontal pressure in this case is "K m" and the lateral earth force is termed by "P m" Calculation of at rest lateral earth force " þ " for different cases: Firstly the value of K m can be calculated as following: K m=1−sinϕ PROJECT : DATE STRUCTURE: STABILITY OF WEIR FOUNDATION ( FOR DESIGN FLOW) DESIGNED REF CALCULATIONS OUTPUT Lw2 Ls H1 V1 H2 H V2 F1 t4 t3 Ww h1 h2 Lx t1 t2 F3 INPUT DATA (ENTER FIGURES IN RED CELLS ONLY) LEVELS Weir crest level 561. For your convenience, I formulated the above equations in a spreadsheet. applications of probability theory entitled 'Evaluating calculated risk in geotechnical engineering' One of the most useful software packages for probability analysis is a Microsoft Excel of slope stability and other mining problems. Safety Design Factor (DFwph) = DFwphHs 0. The powerful optimization tool of Excel is employed to obtain the factor of safety of the Oct 10, 2014 5. Example S. 9 m Tail Water Depth 0 m WEIR BODY Height of the weir H 1. w / h = Embankment Slope (Slope angle the most important) GEOMETRIC FACTORS AND SLOPE / FOUNDATION STABILITY. Rock size based on formulae Van der Meer and Van Gent Design stability number CONCRETE UNITS (single layer) excl. 04 1. Feb 4, 2013 A new definition of the factor of safety—the vector-sum factor of safety in the spreadsheet software Microsoft Excel for efficient calculation. Chapter 17 covers foundation prEN 280:2009 (E) 5 1 Scope 1. The hoist beam is an S15X42. Designs using quantitative risk analysis may dictate these minimum structural and stability requirements be exceeded but never decreased. Design Frequency Selection Table 2. Careful consideration must be given to strength, temperature, corrosion, vibration, fatigue, and many other variables. 00 40. usace. An unstable slope is considered to have an unsatisfactory factor of safety unless supported by internal and/or external measures. 50 for slopes In the current practice, to determine the safety factor of a slope with two-dimensional circular potential failure surface, one of the searching methods for the critical slip surface is Genetic Algorithm (GA), while the method to calculate the slope safety factor is Fellenius’ slices method. The new computed factor of safety is the total resistance divided by the total driving force (Wsinα). 2, Armour. 11. • Assess which variables involved in calculating FS are mostly likely to change. 3401 = 1. 405 Ksf. For the design example, the critical failure surface is shown in Figure 3 where the factor of safety is 1. 5 “Back-Calculation” or “Back-Analysis” Method . 0 can calculate factor of safety for a single wedge defined by a pair of discontinuities as well as plot distribution of factor of safety values for all possible intersecting discontinuities that potentially can lead to wedge failures. Cohesion and and Discussion friction angle anisotropic Functions. Dunlop – Conveyor belt technique design and calculation The calculation of the thrust force for pipeline installation using the Direct Pipe method J. Bob DunkleyBSc CEng MICE Material selection of compression springs can be done from listed spring steels including music wire, stainless steel wire, chrome vanadium, etc. 5 2. 0, 7. safety factor determination is common for slope stability analysis and is factor Fs is calculated using the simplified Bishop method for circular slip surfaces. Mar 5, 2008 The geotechnical aspects of final cover system slope stability follow reliability in addition to a factor-of-safety approach. 3 during construction. The analytical solution is more accurate than Fellenius' slices method. 3 Safety factor of FRP (S1, S 2) Strength Criteria of Material (S 1) Stiffness Criteria of Structure (S 2) 1. publications. The program combines an intuitive user friendly interface and the analytical philosophy behind the popular slope stability program, STABL, developed at Purdue University. and creation of a lower slope by excavation. 4 in addition to this safety factor, to account for its reduced stability. • Using soil strength with a factor of safety - AREMA recommends a factor of safety of at least 2 and as much as 5 or more depending on the traffic (wheel loads and load repetitions) and soil conditions. Chapter F and Appendix F of the AISC LRFD Specifications (Part 16 of LRFD Manual) 3. G. The slope of 1V:2. Advanced calculations of safety factors for slope stability. Berrak Teymur RETAINING WALLS are usually built to hold back soil mass 1. 283 – 0. A. 57 greater of 12" or 2D50 Vertical Drop Horizontal Slope Length Sq. 02 and 0. 69. 00 57. High pore pressures may adversely affect the stability of a slope due to a decrease in several Method of Slice solutions, calculating one Safety Factor based on moment equilibrium and Hand or spreadsheet calculations can take hours to advanced spreadsheet techniques (including simple VBA skill, Solver optimization, array formulas ) useful beyond the slope stability context of the paper. 091 795. Determine the loads based on the building’s parameters (Section D. ECDesigner™ quickly calculates site-specific conditions (e. Landslides – Activity 2 Excel Factor-of-Safety 1 Landslides – Activity 2 Excel Factor-of-Safety Author: Ronda Strauch Overview This activity builds on the mini-landslide activity. As mentioned in Section 1. Chapter F and Appendix F of the Commentary of the AISC LRFD Specifications (Part 16 of LRFD Manual) Basic Theory Instructional Material Complementing FEMA 451, Design Examples Seismic Load Analysis 9 - 17 1a, 1b) Stiffness (Soft Story) Irregularity Vertical Structural Irregularities Irregularity (1a) exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. and anchor forces were effectively zero. L. A suitable safety factor can be applied to the calculated ultimate bearing pressure where sufficient experience and practice have established appropriate safety factors. All other 25, Maximum side slope θ1, percent, 50. Simplified Bishops Method - Misc. Figure 5 shows the change in factor of safety for the design case used earlier (with the ex-ception that the toe is level and the crest slope varies). Figure 5 presents the factor of safety and critical slip surface for Case 1, in which the rock joint was defined using the Barton-Choubey model. (2) Three-dimensional limit equilibrium analysis methods consider the 3-D shapes of slip surfaces. 2, Version 1. Probabilistic Stability Analysis (Reliability Analysis) Key Concepts Sliding stability analysis of concrete or embankment dams does not lend itself well to the event tree method in all cases, particularly under normal operating conditions. 2 FACTORS OF SAFETY The factor of safety is commonly thought of as the ratio of the maximum load or stress that a soil can sustain to the actual load or stress that is applied. Created Date: 6/12/2014 2:43:20 PM Factor of safety sliding = Resisting horizontal forces / driving horizontal forces. cost of buying or renting new materials •Cost of a higher grade of material vs. to use EXCEL workbook that is freely available to readers, and that Keywords: Slope stability, limit equilibrium, method of slices, Bishop Predict hillslope stability using the Factor of Safety (FS). Water stored behind a dam represents potential energy which can create a hazard to life and property located downstream of the dam. The new method was used to calculate the soil slope safety factors for registered trademarks of GEO-SLOPE International Ltd. Figure X. Finite element analyses are discussed briefly in Appendix C. When the seismic slope stability factor of safety approaches 1. Apr 14, 2018 · Shear Reinforcement Calculation Slope Stability by Bishop Method VBAm Soil Bearing and Pile Capacity Calculation Spreadsheet Soil Loss and Sediment Discharge Calculation Tool SoilLossTool - Soil Loss and Sediment Discharge Calculation Tool Spread Footing Design Spreadsheet Spreadsheet to Calculate Floor Vibration Steel Element Design Free online courses of Civil Engineering including but not limited to Soil Mechanics, Design of Concrete Structures, Design of Steel Structures, Design and Analysis of Foundations, and Perform a Spencer’s method slope stability analysis to determine the critical slip surface with the water load only on the ground surface and no piles. Assuming that the allowable bearing pressure of the soil is 120 kNm 2, the elevation and angle that minimizes the factor of safety. and EXCEL spreadsheet calculations, it was concluded with reasonable confidence that: Abstract. 6 m Width of weir at crest Lw2 WHO Guidelines on Stability Evaluation of Vaccines The views and opinions expressed in the following PowerPoint slides are those of the individual presenter and should not be attributed to Drug Information Association, Inc. This activity is designed to expose students to one of the classic equations used by geologist and engineers to investigate and understand the stability of a hillslope, especially as it relates to soil moisture. the methodology for calculating the factor of safety of earth slope of any specified methodology with the help of Microsoft Excel program for various methods Feb 16, 2018 A slope is judged to be safe for a design earthquake if the factor of safety is recommends the use of this approach to calculate seismic coefficient. Its latest version, PCSTABL6, allows also the analysis of reinforced soil slopes with geosynthetics, nailing, and tiebacks. The reliability, R, is then calculated using the NORMDIST function in Excel, with βLN as the argument Jul 2, 2012 6. stability calculation is possible. In such a case, SoilStructure Retaining Wall design software allows you to enter the GWT height at the top of the backfill. b2) Moment - rotational stability of shoring systems: This type of calculation considers the stability of the shoring for rotational failure of the wall. is a slope stability analysis program that also incorporates features for retaining system designing. The vertical slice method is generally adopted for calculation of slope stability safety factor. S. Examples C1 through C5 are a set of examples that illustrate the elevation of a single-story home with a crawlspace. : XSTABL provides an integrated environment for performing slope stability analyses on an IBM personal computer, or compatible. 5) Preface Tech Doc U. The most recent empirical correlations of NSPT, relative density and angle of shearing resistance of granular soils are calculated using the penetration resistance in terms of N60 (NSPT=N60 according to Cestari, 1996) or of N1,60, normalized value at a geostatic vertical pressure of 1 bar by applying the coefficient CN (Liao and Withman 1986). The results of a slope failure can often be catastrophic, involving the loss of considerable property and many lives. Aesthetics is also a factor when selecting the most suitable abutment type. In this video we demonstrate a slope stability example using the Swedish Method of Slices. in Canada and other simpler methods can even be done on a spreadsheet. Diehl, WISE Uranium Project, Arnsdorf, Germany VERY VERY EXTENSIVE. Apr 11, 2018 equation to compute the factor of safety of slopes based on these representations . The stability of a natural slope is also important. 9, calculate Factor of Safety (Fs) for multi-layer streambanks. Reference. Information includes bearing capacity factors with relation to the angle of internal friction, bc factors from Terzaghi, Meyerhof, Vesic and Hansen, bearing capacity factors for drilled piles, driven piles, deep foundations, and shallow www. The pedagogic (Equation of P is long, may use VBA coding) factor of safety (F) of. Mar 17, 2014 · This paper proposed a new method to determine the minimum slope safety factor which is the determination of slope safety factor with analytical solution and searching critical slip surface with Genetic-Traversal Random Method. . SAFETY REQUIRED The Municipal Code specifies 1. Access Premium Content - ChE Plus . If not, iterative analysis need to be carried out to obtain the correct soil nail resisting force for slope stability analyses. 1 Overview This chapter covers the geotechnical design of bridge foundations, cut-and-cover tunnel foundations, foundations for walls, and hydraulic structure foundations (pipe arches, box culverts, flexible culverts, etc. Verification of safety factors with respect to sliding and overturning for external stability will follow relevant rules and regulations set forth in the 1994 AASHTO Interim This procedure is intended to be readily calculated by hand, although use of calculation software such as Mathcad or Excel will be useful for design iterations. 84 (MS-DOS). Method Factor of Safety Bishop Simplified 1. 0 q u for "normal" traffic and safety factors must be met as a minimum. 4 Temporary 1E-03 1. xls" spreadsheet workbook. army. Calculation results generated by the compression springs calculator are solid height, torsional shear stress at solid height, factor of safety against yielding, buckling check, spring outer diameter CED Engineering offers online PDH Courses for continuing education. 0 for 1*D 100 or 1. 0, slope deformations become likely and when liquefaction is expected, these movements can be substantial. Note: Presently, hydrologic load uncertainties are addressed in a Robustness (freeboard) study (see Chapter 2, “Hydrologic Considerations” in this design • Factor of safety versus height-to-width ratio of conventional cantilever retaining walls, neglecting passive pressure • As the footing width is increased the FS against overturning, bearing capacity and base sliding all increase determine shear strength parameters of landslide slip. 50, 27, Custom Factor, 124. Crib Wall Design Basic soil parameters; Unit weight of soil Stability of Beams 161 Appendix E (Non-mandatory) Local Stresses in Fastener Groups 162 Appendix F (Non-mandatory) Design for Creep and Critical Deflection Applications 167 Appendix G (Non-mandatory) Effective Column Length 169 Appendix H (Non-mandatory) Lateral Stability of Columns 170 Appendix I (Non-mandatory) Yield Limit structure, then, is a matter of analysis for external stability and internal stability based on the mechanics and material properties of the structure. The work presented in this report is a deliverable within the framework of the Administrative Arrangement SI2. The factor R therefore depends on the ratio between the distance present between the piles and the diameter of the piles and by the factor R p which takes into account the arch effect. Calculation of linear-elastic deformation Slope stability analysis All stability equations used herein are implemented in the spreadsheet-model ARMOUR. What is trying to “pull” slope material down? 1 1 Slope stability analysis 2 1m 1m Unit of stress: 1 kilopascal kPa = 1 kN/m2 (Kilo Newtons per square meter) 1,000N Slightly above-average American male FHWA NHI-06-088 6 – Slope Stability Soils and Foundations – Volume I 6 - 5 December 2006 6. This option is fully automated and can be used with either Mohr-Coulomb or Hoek-Brown strength parameters. 2 log (R/W), outside bends C t = thickness coefficient 1. Reinforced slopes flatter than 45° to the horizontal (1H:1V). 75 0. floodproofing, and construction of a floodwall in a residential setting. ). Key Questions. 1b) whose buckling load is the same as that of the end-restrained column. 3213 GLE/Morgenstern-Price 1. com The Need for Stability Analysis Stability assessment is a critical aspect of all drug development activities. improve the stability of slopes in an effective manner. 4. Factors of Safety for Deep Foundations for Downward Loads Design Factor of Safety, F Classification of Structure Acceptable Probability of Failure Good Control Normal Control Poor Control Very Poor Control Monumental 1E-05 2. Semi-Gravity Types 3. This is the minimum f = safety factor (1. The analysis parameters can be customized if required. soil nail walls, shotcrete and anchor walls, Application and stability criteria for rock and artificial units Jentsje W. The factor of safety values can be exported. Example C6 = c + tan [c'b 4- tand(W — seca tall . 4) common intercept and slope (pooled batches) – Model #2 is not allowed following ICH guidelines still considered an important mo del to consider by colleagues for stability limiting characteristic s that should be at 0% or 100% at 0-months storage time Pharmaceutical Stability Shelf Life August 1, 2010 12 ICH Estimation Issues Bearing Capacity Factor publications, software and technical guidance for the career development, information, and resources for Geotechnical Engineers. the factor of safety of a slope against shear failure. 25) C s = stability coefficient for incipient failure 0. Slope protection/facing toslopes where the global factor of safety (FS) of the slope without the slope protection/facing is greater than 1. Included are 15 premium MS Excel spreadsheets, 26 premium article titles covering engineering data and maintenance, and equipment specification sheets in MS Excel format for 22 different types of equipment. stability analysis is required. Amendment to Cl. An approximate check of calculations can also be performed using the Ordinary Method of Slices, although the OMS will usually give a lower value for the factor of safety, especially if φ is greater thanzero and pore pressures are high. SLOPE/W, the Anisotropic Function is applied to friction angle (rather than coefficient of friction). Essentials in Stability Analysis and Expiry Determination Thomas A. Counterfort Strectcher Headers Filled with soil Face of wall 5. 2 Theoretical background of KEM The theory of KEM includes three parts: kinematics analysis, static analysis and optimization. cost of lower grade of material plus labor to improve for Table 2. 0, requires slope height, slope angle, discontinuity plane inclination, position and depth of tension crack, and ground water conditions along the discontinuity plane/tension crack (Figure 5). Maximum slopes of cuts and fills may be determined by the geotechnical engineer from experience and from observation of slopes in the vicinity which have a long-standing history of stability, are of similar height to the proposed slope and are of apparently similar geological formation. Gravity 2. 0 (April 1998) 36, F, Average Factor of Saftey, 1. distributions for the calculation of the factor of safety of the overall slope with a tension. It is not intended as a textbook of soil mechanics or geotechnical engineering. Chapter 8 Foundation Design 8. 32 17, 20. xls (see ANNEX I), which can be used for the design of seadikes/revetments, high-crested and low-crested (emerged and OGI offers combined geotechnical and groundwater control design solutions for temporary and permanents works. Embankment Stability: EMBANKMENT STABILITY – RIGID INCLUSIONS Differences in Design Methodology between Granular & Grouted Inclusions 2D plane strain gives a good approximation of deformations - Tends to over-estimate the load transfer to the rigid inclusions Limitations of FEM Modeling - Not easy to obtain the factor of safety against failure The information required to estimate the factor of safety for a slope are: the soil and water profile, the kinematics of potential slope failure, the strength and weight of soils, and the proposed slope geometry. In the Analysis mode, MSEW computes the factors of safety corresponding to prescribed layout. = 3. Allowable bearing capacity is what is used in geotechnical design, and is the ultimate bearing capacity divided by a factor of safety. 42 LANDSLIDES Calculated factor of safety Nov 04, 2014 · https://goo. Use the following values: Concrete unit weight = 150 pcf Soil unit weight, γ soil =110 pcf Coefficient of Active Soil Pressure, K a = 0. The slope safety factor was defined by considering the effects of the intermediate principal stress and at-rest lateral pressure coefficient. REINFORCED SOIL SLOPES AND EMBANKMENTS For the purposes of this document, a reinforced slope is defined as a compacted fill embankment that incorporates the use of horizontally placed geosynthetic reinforcement to enhance the stability of the soil structure. 1a) gives the length of an equivalent pin-ended column (Figure 17. 00 1. (See Reference 1 and 2). (In the case of fracture strength, tensile strength and flexural strength; in the case of stiffness, tensile modulus and flexural modulus. The calculation of slope stability safety factors is a routine practice. safety factor (Table 3. Methodology . Q1(a): Analyze the stability of the reinforced cantilever retaining wall as shown in Figure. 2 Example Wall . 6/12/2013 President Thomas A. Specifically, step-by-step procedures to determine the factor of safety using the Ordinary Method of Slices, Bishop’s Simplified Method, Simplified Janbu Method and the Lowe and Karafiath Method are provided. It is shown that extending from the deterministic factor-of- safety calculations among spreadsheet cells connected by circular references will. 00, [SM]_ Silty_sand, Yes, L, Slope Displacement: TRUE 42, 1, 1 = Calculate FPGA Automatically. The export of data to Excel may facilitate such further calculations. Yds. I-7. 4636. Relative Runup Ratio (R/Ho)From TR69 Figure 12 Relative Runup with the protection of both the health, safety and welfare of the people and the conservation and protection of the natural resources of the State. The calculator searches the circular slip surface for which the factor of safety is minimal. (Eds), Slope Stability 9, calculate Factor of Safety (Fs) for multi-layer streambanks. 5 m Weir bottom level ( River bed level) 559. 3 – Overall (Global) Stability (per A11. According to the information involving the factor of safety and the critical slip surface in a specific cross- section, strength parameters can be back calculated. In this case, evaluation of the wall with this geometry shows a larger reduction in safety factor for ICS than for global stability. 0 is widely used in anchor bolt design. 00 105. PE Continuing Education. of stability of an infinitely long slope is initially introduced. It is a slightly modified JavaScript clone of the slope stability software STABR Ver. 3 3. xls 38, Permeability factor of armour slope Van der Meer, 0. 00 62. 40 4. That is because stability, or lack thereof, results from an interaction between the applied loads, Overturning factor of safety lb/ft Siding factor of safety ≤ ω COULOMB'S THEORY Check Sliding Frictional force Eccentricity Check Bearing Applied bearing pressure Input Values ∑W (Resultant is in middle one third) Inclination angle to vertical plane Backfill slope angle above wall Embedment Cohesion ² Overturning moment coefficient Active Physically, the K-factor is a factor that when multiplied by actual length of the end-restrained column (Figure 17. - SI Conversions DISCLAIMER:€ During the editing of this manual for conversion to an electronic format, the intent has been to convert the publication to the metric system while keeping the SPT conversion to N60 and N1,60. Input from EXCEL files Recalculate function to evaluate the safety factor of a specific surface with center X0 Identification of the critical slide surface though automatic calculation Jan 2, 2010 When the seismic slope stability factor of safety approaches An Excel spreadsheet that performs these calculations has been prepared to methods (Cavounidis, 1987) show that factors of safety, calculated using three- available slope stability program or even a standard spreadsheet program. 2 is a 2D limit equilibrium slope stability program based on STABL6 but which includes geogrid reinforcement, piers/piles, tiebacks, soil nails, applied forces, and surcharge loads. C. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Soil model parameters were established from back-analysis of performance data from a near-by instrumented dike. 1 & Table 11. 3) Overall stability of the wall, retained slope and foundation soil or rock shall be evaluated using limiting equilibrium methods of analysis (A11. Ultimate bearing capacity (q f) is the theoretical maximum pressure which can be supported without failure; allowable bearing capacity (q a) is the ultimate bearing capacity divided by a factor of safety. The lion’s share of the extensive SVSLOPE ® 2D feature The conveyor belt calculations methodology discussed in the article is to be used only for the guidance on calculating the initial conveyor design parameters; the final design must be validated by using the FEA or other similar tools before building the prototype. - Macstars 2000 checks the stability of reinforced soil slopes. 42. The program is rooted in RUSLE. Developed by the makers of GEO5, the easy-to-use free software ensures all the details of your project are accounted for while the robust input options allow for extremely precise geotechnical modeling. 0 for straight channels, inside bends 1. INTRODUCTION Guidelines to Horizontal Curves A Policy on Geometric Design of Highways and Streets y Horizontal Alignment (pg. 00313χ0. Keywords—Retaining wall, Earth wall, Mechanical behaviour, internal stability, limit equilibrium. 5) so that the overall factor of safety remains 3. (“DIA”), its directors, officers, employees, Dec 26, 2019 · There are some municipalities that don’t allow subdrain behind a retaining wall. Army allows a design unconfined compressive strength (q u) of 1. This new worksheet deals with octagonally shaped rigid spread footings, and will perform the bearing pressure analysis, as well as stability checks for both overturning and sliding. 2 DESIGN FACTOR OF SAFETY A minimum factor of safety as low as 1. 0 (1. This will have an effect on stem design, toe & heel bearing pressures, sliding factor of safety and overturning factor of safety. 3, 10. α = slope angle For ξcr < ξm Equation 3 applies and for ξcr > ξm this is Equation 4. 8 Expanded from Reese and O’Neill, 1989. Compatibility of Excel Modular Scaffold: Excel scaffold is designed and engineered to be compatible with standard tube and clamp components (i. For rounded rock, the spreadsheet adds a factor of 1. 1, in Hong Kong, an overall factor of safety of 3. This research aims to determine slope stability before and after the gabion installation, as well as to find out the change influence in fluctuations of groundwater, the configuration gabion installation and the presence a combination of load (dead load + life load) towards safety factor (SF). Sample Design Calculations. 1 Factor of Safety for Slope Stability Analyses . It uses finite element computed stresses from either SIGMA/W or QUAKE/W to calculate a stability factor by computing both total shear resistance and mobilized shear stress along the entire slip surface. The methods Using a combined slope hydrology and stability model to identify suitable. ENGINEERING GROUP CIVIL DESIGN CRITERIA FOR ROAD AND RAIL TRANSIT SYSTEMS E/GD/09/106/A1 Controlled Document A1 Feb 2010 Chua Swee Foon AgDyM Wen Dazhi DDCDE Neo Bian Hong D(Desg) Paul Fok GDE Reference renamed from PED/DD/K9/106/A7. Safety factor is defined as the quotient of the sum of forces tending to resist failure divided by the sum of forces tending to cause failure. Similar to plane failure analysis, DipAnalyst 2. 236 Equation 12 Table 3. 2, Project Name. Safety Design Factors for Waves and Riprap Table 3. Slope stability analysis (Bishop's method) can be invoked to assess the safety for slope stability for weathered and un-weathered strata. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet . 3, 5. , gradients, project area, factor of safety) and delivers comprehensive outputs for design and submittals assistance. 18, 25. 3 2. Part 5 of the AISC LRFD Manual 2. equation gives the factor of safety with respect to moment equilibrium (Fm) while the other equation gives slope stability analysis based on Janbu's GPS, and a probabilistic analysis that obtains tion tool. Users can perform classic limit equilibrium slope analysis of soil or rock slopes by the method of slices or newer stress-based methods. In general it involves two steps: First, calculate the factor of safety for a specified slip surface using the method of slices. 3 Size Dn, 50, Stability, Size Dn,50, Correction, Size Dn,50, Van Gent 2005, Emp. 00, [SM]_Silty_sand, Yes, 4. 5*D 50 (c) Calculation of the bearing pressure required for ultimate shear failure is useful where sufficient data are not available to perform a settlement analysis. It has the most comprehensive total set of material Instructional Materials Complementing FEMA 451, Design Examples Foundation Design 14-2 Load Path and Transfer to Soil Soil Pressure Force on a pile EQ on unloaded pile Pile supporting structure Lateral Earth Pressures and Retaining Walls Assistant Prof. van der Meer Consultants for Infrastructure appraisal and management, Infram 1 INTRODUCTION The design tools given in this chapter on rubble mound structure armour layers are based on tests of schematised structures. 31, Compatible with Excel 2010 and more recent versions. gl/7i318r For more FREE video tutorials covering Slope Stability and Soil Mechanics. 3 for angular rock C v = vertical velocity distribution coefficient 1. Concrete cantilever wall example. The Spencer method of slope stability analysis was used to assess the stability of the wall using the same rock mass parameters as in the UDEC analysis. 3) 53:134 Structural Design II Design of Beams (Flexural Members) (Part 5 of AISC/LRFD) References 1. Care must be taken when fixing the shear surface emergence point to ensure that the shear surface does not re-emerge from the slope and form two failure blocks (the model does not look for this, but this is very easy to spot on the bank profile diagram). geometries and determines the wedge that yields the lowest factor of safety. ) ¾A key factor in the design of the perimeter embankments is their stability • Internal – Inside face and outside face • External – Global failure and siding ¾Major issue is the development of pore water pressure in the sub-grade due to embankment construction • Slope/w and Seep/w used to examine the effects of pore water * If the retained earth has a surface slope that varies, then the design surface slope shall be based on an imaginary line starting from the top of the retaining wall to the highest point of the slope. 526 Kcf is directly inputted from Y = 0 with starting pressure of -0. ** Top of wall shall be restrained byrigid diaphragm. 0 2. The algebraic expression of the slope stability safety factor Fs is deducted based on the idea of the calculation via the inclined slice method and according to the inclined slice force limit equilibrium conditions. And applying a factor to the end result, zero, did not add any safety. 4 44, Safety factor Stone sizes in double layer, 1. 4 seepage forces). 2), based on waterway importance or desired design life, quality of rock selected, etc. • Construct an Excel ::Stability Analysis (12:00 – 1/1/97) 1, Janbu Slope Stability – Input Parameters. Extensive studies have been under- taken in this area, and a variety of these methods are available for generalized slip surfaces. c) Bearing Stability in sheet pile wall design: In all cases a retaining wall has to be founded in some kind of base material (be that rock or soil). Calculate the factor of safety with respect to overturning and sliding,. Analysis and design of cantilever walls using global and partial safety factor concepts. This broad definition encompasses many and varied applications. 1 the factor of safety F, with respect to strength, may be expressed as follows: For infinite slopes that have seepage at the slope face, the factor of safety for slope stability is determined as follows: FS = Slope Stability Analysis Geotechnical Design Manual M 46-03 Chapter 7-4 December 2006 Slope Stability Analysis Detailed assessment of the groundwater regime within and beneath the slope is also critical. 16 Design of a cantilever retaining wall (BS 8 110) The cantilever retaining wall shown below is backÞlled with granular material having a unit weight, , of 19 kNm 3 and an internal angle of friction, , of 30 . This value of the safety factor should be increased to a minimum of 1. 0 Permanent 1E-04 2. Then, it calculates for this slip circle the corresponding critical seismic coefficient for which the factor of safety is 1. 26, Known 41, TABLE 5: SAFETY FACTOR CALCULATIONS. How do “friction” and “cohesion” work together to stabilize slopes? 2. e. 37, Number simulation of slope stability analysis will be developed using Microsoft Excel and find Key-word: - Slope Stability Analysis, Factor of Safety. 5 4. Some software have the capabilities to automatically update the resisting force based on the computed critical slip plane. GSTABL7 with STEDwin v. 9 and spans around 26ft without support of the compression flange making its Lb value 26ft as shown in Figure 3. Pfeff and H. Keywords: slope stability, slope design, engineering geology, fault, open pit mines, SOMAIR uranium mine, OCP phosphate mine 1. 2 Cantilever retaining wall with horizontal backfill, surcharge, and key Slope Stability. Suggested range is 1. 3 (typ. 40 ft/ft. The stability number, which depends on soil cohesion and friction and the slope angle from the horizon is defined as: c H N C S γ = A retaining wall that relies solely on it’s own weight to stand up is called a gravity wall. SOLUTION: Several different searching schemes were used to find the lowest factor of safety Required minimum factor of safety Saturated unit weight Slope (Horiz/Vert) Slope Angle SLOPE STABILITY ANALYSIS Unit weight of water Slope Stability Analysis For Outside Slope of Recharge Trench Berm INFINITE SLOPE THEORY WITH SEEPAGE FORCES Project Name Input Data Intermediate Calcs Answer 120. In this study, two methods of analysis of the calculation sheet were developed, that are Ordinary. Pruiksma, D. The factors of safety Fc, Fφ, FH are only occasionally used in slope stability A technique for the calculation of slope stability based upon the assumption of a Abstract The spreadsheet method for slope stability analysis based on Excel takes the advantages of powerful calculation function of the spreadsheet. mil Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure. 2 Factor of Safety The goal of a slope stability analysis is to find out safety We will use the results of the spreadsheet calculation from the Sep 1, 2015 The generally acceptable static factor of safety for slope stability is equal Use this spreadsheet to calculate Gmo, τmo, and T. Due to the complexity of this type of analysis a global stability factor of safety. Check factor of safety against sliding. Manual: Geotechnical Manual Effective Date: March 01, 2018 Purpose This manual provides guidance to districts in geotechnical investigation and design for project development. 5 as the minimum acceptable static factor of safety for cut, fill, and natural slopes. Slope performed to evaluate overall stability of the wall and excavation using axis-symmetric model and to design an excavation-wall system which yields a minimum factor of safety of 1. A slope This teaching tools outlines the procedures to develop Excel Spreadsheets for four commonly used slope stability analysis methods. Contents The revisions contained in each chapter of this version are to clarify the policy and high-level procedures published in 2012. Geosynthetics may crack under constant stress, and for geonets, constant stress may cause the collapse of the drainage pathways before becoming an independent engineering and safety consultant, specialising in cranes, hoists and access. The factor of safety (FS) was greater than 1. This is because plastic materials creep under stress, and over time, the thickness of the geosynthetics will decrease under constant stress. It is also possible to excavate deeply and lower the main road surface if the right-of- way crosses the upper part of a landslide (see section on Cuts and Fills). 1 - 1. 4 2. 50 23, 51. Little Consulting 12401 N Wildflower Lane Highland, UT 84003 1-925-285-1847 drlittle@dr-tom. 1 Cantilever retaining wall with horizontal backfill, no surcharge. 8 3. Since the required resistance factors vary among different failure modes, the load factor will be given in Equation (1. Cantilever Reinforcement Reinforcement Counterfort 4. Calculations with a trial factor of safety equal to 1. (deterministic) approach to slope stability analysis and design, the shear strength, slope geometry, external loads, and pore water pressures are assigned specific unvarying values. Students consider the balance of forces on a hillslope using the Factor of Safety by calculating shear stress and shear strength for an example hillslope and formulating an expression for the factor of safety in an Excel computed stresses in a slope can be u sed to compute a factor of safety. 3). While with Laing he was heavily involved in the first CIRIA crane stability project and has been involved in the drafting of a number of crane related industry standards and publications. SLOPE/W can also perform finite element stress-based stability and dynamic stability analyses. Slope Stability Calculator "determines the factor of safety for a soil slope. I have added a new worksheet to the "FOOTINGS. Selecting the right fastener material from the vast array of those available can be a daunting task. Our solutions are underpinned by mathematical modelling and have proven particularly cost effective where groundwater conditions threaten the safety or integrity of an excavation or structure, or where uncontrolled groundwater conditions could jeopardise the critical path of the To calculate factor of safety for plane failure, DipAnalyst 2. Table 3 shows the calculations when the trial factor of safety is 1. 50, 18, Custom Factor, 124. Waterway slope should be between 0. For the calculation of bearing capacity of soil, there are so many theories. The example calculations are made here using Mathcad. The problem was that this design approach required two inconsistent calculations – one for the slope stability (effectively with factored soil strength) and a different one for the structural design, in OSHA Rules for ScaffoldingOSHA Rules for Scaffolding LLoad Chartoad Chart For towers exceeding four (4) tiers high, subtract dead load weight/leg of frames, crossbraces, and brackets above the 4th tier to obtain an allowable load/leg for workman, materials, and planking. 133 Redi-Rock Wall Freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of Redi-Rock gravity walls. 2 - GSTABL7 with STEDwin v. The graphics and the ‘point-and-click’ data input are also very good and makes the program very easy to use. factor of safety calculation for slope stability xls