Slope stability is an intuitive program for the analyses of all types of slopes and retaining walls. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo. Friction circle theory has been around for about 100 years and is probably the most accepted method of analyzing soil slope stability. Matlab script for slope stability calculations with comsol. The program uses the method of slices and offers a variety of established methods for calculating interslice forces. The aim of slope stability analysis of any natural or manmade slope is to determine the failure surface that has the lowest factor of safety.
Slope stability analysis by swedish slip circle method. The calculator searches the circular slip surface for which the factor of safety is minimal. For a circular failure surface, the centre of the circle is. Recommended stability methods gvariations of oms are bishop method, simplified janbu method, spencer method, etc. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. The number of equations of equilibrium available depends on the number of slices n and the number of equilibrium conditions that are used. In addition, the type of slip circle was also investigated. Pdf slope stability analysis limit equilibrium or the finite element. This increase in the cohesion of the soil is a function of the angle.
Baker 2003 proposed a complete solution to taylors stability. Slope stability and stabilization methods, abramson, lee w. These analyses are often completed using slope stability charts and the dsara deterministic stability analysis for road access slope stability program. Lianga a school of civil and hydraulic engineering, dalian university of technology, dalian 116024, pr china bcenter for rock instability and seismicity research, northeastern university, shenyang 16, pr china article info. Symbol parameter dimensions f factor of safety against sliding along sheet joint calculated h height of the overall slope or of each bench 60 m or 20 m respectively. Utexas4 is a computer software application for computing the stability of earth and earthrock slopes and embankments. Circular slip example slope stability soil mechanics. An introduction to slope stability and protection j. Slope performs twodimensional slope stability analysis to study circular or noncircular slip surfaces. Slope stability evaluations by limit equilibrium and finite. The authors dealt with a difficult project in northern peru involving a threedimensional 3d slope stability analysis of a mine waste dump. Slope stability publications, software and technical guidance for the career development, information, and resources for geotechnical engineers. New methods and insight, second edition provides helpful practical advice and design resources for the practicing engineer. Xstabl provides an integrated environment for performing slope stability analyses on an ibm personal computer, or compatible.
For a horizontal slope of uniform soil, a logarithmic spiral surface of angle. Comparison of fos by various methods of analysis slope a, equation 2. Since, ec7 does not have a special provision for the problem of a footing on the crest of slope, the question whether it is a bearing capacity or a slope stability problem remains. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Numerical analysis of slope stability based on the gravity increase method l.
It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. Introduction on circular arc failure of slope analysis. However, in the case of ground consisting of horizontal sandy layer, it is known that modified fellenius. Morgensternprice method is completed for noncircular slip planes only. Numerical techniques for slope stability analysis the objective of this course is to provide a background on numerical modelling for slope stability analysis using various rocscience software tools. Xflr5 xflr5 includes the xfoil program for foil analysis, and several 3d analysis methods for planes.
Verification hand calculations geoslope international. Utexas analyze the stability of complex slopes software. Pore pressures in a freedraining fill are governed. The weight of the slice of width b and height h having a unit dimension into the page is given by. Application note slope stability analysis worked example 1 introduction this note describes the typical steps followed in setting up and analysing a slope stability problem with limitstate. The ordinary method om satisfies the moment equilibrium for a circular slip. The use of the slip circle in the stability analysis of slopes. Seepw generated porewater pressures in slopew stability. The slip circle method of slices is commonly used in the analyses of slope stability and bearing capacity for multilayered ground. There are various methods for determination of slope stability via limit equilibrium method i. Soil slope stability analysis using the friction circle.
Slope stability free slope stability software download. Subsurface exploration, testing, slope stability, embankments, cut slopes, shallow foundations. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. Get the most out of the rocscience slope stability suite through a balanced mixture of lectures and handson computer analysis.
Geoslope international ltd, calgary, alberta, canada. Includes recommendations for analysis, design practice, design charts, tables, and more. For an additional 9 years he was a principal advisor to. Numerical analysis of slope stability based on the gravity. You can also include faults and discontinuity planes in. Stability analysis utilization of advanced numerical techniques pdf.
Experience and observations of failures of embankments constructed over relatively deep deposits of soft soils have shown that when failure occurs, the embankment sinks down, the adjacent ground rises and the failure surface follows a circular arc as illustrated in figure below. Slope stability drawing the slip circle and slices on vimeo. Generalised framework of limit equilibrium methods for slope stability analysis. This thesis deals with slope stability evolutions carried out by commonly used limit. Slope stability analysis by swedish slip circle method using. Shear strength for slope stability analysis fattdad geotechnical 6 jun 17 11. The slip surface that has the lowest factor of safety is considered to be the critical failure surface.
Shear strength for slope stability analysis slope stability. Swedish slip circle method factor of safety for the slice is equal to the ratio of the resisting moment i i. Wright of shinoak software, who is wellrecognized as one of the leading experts in solving problems in soil strength and slope stability duncan and wright, 2005. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. In this equation the moments have been taken about the centre of the circle. Upon returning to the main menu, the designer is ready to conduct the various stability analyses.
The method of variational calculus is applied to obtain the shape of slip surface and the corresponding normal stress distribution. 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. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer. Circular arc stability analysis ordinary method of slices o firm soft firm slip surface fill c i r c l e r r. The swedish slip circle method assumes a circular failure interface, and. These methods include fellenius or swedish slip circle analysis, the bishop horizontal or constant inclined interslice. The probabalistic sara stability analysis for road access program is still under development. However the minimum constructive elements provided in the program do not allow the software to perform analysis for complex cases. Then, it calculates for this slip circle the corresponding critical seismic coefficient for which the factor of safety is 1. The use of the slip circle in the stability analysis of slopes open pdf.
Paul guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years experience in the design of buildings and related infrastructure. Prediction of the sliding type and critical factor of safety in. Slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma noncircular slip. Determination of the critical slip surface in slope. The q slope method for rock slope engineering and rock mass classification developed by barton and bar expresses the quality of the rock mass for assessing slope stability using the q slope value, from which longterm stable, reinforcement free slope angles can be derived. Information includes slope stability analysis methods, calculations, illustrations, slope improvement methods, slope stabilization, method of circles, wedge method, bishop, slope mitigation, bearing capacity, foundations, shallow foundations, deep. Chapter 10 slope stability analysis nysdot geotechnical page 106 january 21, 2014 design manual 10. However, it is commonly assumed in the analysis of slope stability. Taylors chart is that it does not define the location of the slip circle. The user interface and analysis options are almost identical to the generalised slope analys is module except for the ability to define a slip surface of any general shape. The ordinary method the geometric information about the sliding mass and the discretization can be copied from slope w and pasted into a spreadsheet using the draw graph functionality. This contradicts the report made earlier by spencer 1969.
Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Civilax is the knowledge base covering all disciplines in civil engineering. New slip circle method for analysis of slope stability and bearing capacity. Slide is a 2d limit equilibrium slope stability program for evaluating the safety factor or probability of failure.
Pdf slope stability analysis using modified felleniuss and. Slope stability and stabilization methods kindle edition by abramson, lee w. The objective of the study is to find out the factor of safety of the given slope under static and dynamic loading earthquake condition using swedish circle method, bishop stability method. Here in the swedish circle method, potential failure surface is assumed to be cylindrical in shape i. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement.
Matthews and others published slope stability analysis limit equilibrium or the. May 29, 2018 in this video i have talked about the friction circle method to check the stability of the soil on finite slope. In principle, slope stability analysis is an optimization process in which the lowest factor of safety and its associated critical slip surface are sought. Each limit equilibrium method varies with regard to assumptions used and how stability is determined. The method of stability analysis used see section 6. These days, slope stability analyses are usually performed via software using an appropriate method for the specific site conditions.
May 25, 2015 the analysis of the stability of general slip surfaces authors. Post jobs, find pros, and collaborate commission free in our professional marketplace. Soil slope stability analysis 339 isfied for each and every slice, it is also satisfied for the entire mass. Ordinary method, spenser method, us cops method, morgenstern price method and so on. Slope stability technical guidance on the geotechnical. Janbus simplified method and spencers method account for both circular and noncircular failure surfaces. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. The finite element stresses for the different slip circles are. Using a unified approach to address a medley of engineering and construction problems, slope stability analysis and stabilization.
Considering a slip surface, the factor of safety f m defined with respect to moment is given by. Pdf an overview on methods for slope stability analysis. The same boundary conditions were used in all the slope models that were tested. Slide is the most comprehensive slope stability analysis software available, complete with finite element groundwater seepage analysis, rapid drawdown, sensitivity and probabilistic analysis and support design. It is a slightly modified javascript clone of the slope stability software stabr ver. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. For this method, the failure surface is assumed to be the arc of a circle as shown in figure 67 and the factor of safety against sliding along the failure surface is defined as the ratio of the moment of the total available resisting forces on the trial failure surface to the net moment of the driving forces due to the embankment weight, that is. New slip circle method for analysis of slope stability and. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer. Slope stability demonstration 1 slope stability demonstration this document describes the stability analysis of a proposed soil slope using slide 5.
The soil has three basic properties that are fundamental to the analysis. The ordinary method the geometric information about the sliding mass and the discretization can be copied from slopew and pasted into a spreadsheet using the draw graph functionality. Next the use of the slip circle in the stability analysis of slopes authors. They are certainly major factors in cut slope stability and in.
What are the resulting factors of safety bishop, spencer, janbu corrected and janbu simplified. This is an educational platform set up iit bombay graduates with an aim to prepare you for competitive exams like gate, ese, etc. New slip circle method for analysis of slope stability and bearing capacity takashi tsuchida, kenta mizuno, hideto hikiyashiki 1 in japanese 2 in japanese 3 in japanese. The program combines an intuitive user friendly interface and the analytical philosophy behind the popular slope stability program, stabl, developed at purdue university.
Application note slope stability analysis worked example. Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. Aug 06, 2014 download spreadsheet to calculate slope stability calculation. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. Slide 2d limit equilibrium slope stability analysis software. Out of the various methods of stability analysis of slopes, swedish slip circle method is commonly used in practice. Pdf taylors slope stability charts revisited researchgate. This application enables you to quickly check what angle the ski slope has. An overview on methods for slope stability analysis. Is there any free software available for slope stability. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rockfill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods.
Rules of thumb and easy method of estimating slope stability geology and soils information needed from site or soils database check appropriate loading conditions seeps, rapid drawdown, fluctuating water levels, flows select values to input for. Most methods for calculating slope stability are based on the principles of forces and. Presently, the theory and software for twodimensional slope stability are rather mature, but there are still some important and new findings which will be discussed in this chapter. Bishops simplified method and method of slices considers a circular failure surface. This method of slope stability analysis is not widely used since it has been. Just point your phone with a straight arm downwards the slope and read out the measured angle. Practical slip circle method of slices for calculation of. Use features like bookmarks, note taking and highlighting while. Nov 04, 2014 for more free video tutorials covering slope stability and soil mechanics. Simslope stands for simplified slope stability analysis software.
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