The paper compares six methods of slices commonly used for slope stability analysis. Design of overall slope angle and analysis of rock slope. This guide is based on information provided in slope stabilization and repair solutions for local government engineers, which presents the results of a minnesota department of transportation mndot research project on slope stabilization methods. The method satisfies vertical force equilibrium for each slice. The slope stability analysis has been prepared in accordance with the. The criteria in this em are to be used with methods of stability analysis that satisfy all conditions of equilibrium. The paper describes several examples of finite element slope stability analysis with comparison against other solution methods, including the influence of a free surface on slope and dam stability. The infinite slope solution is also an exact solution, the methods of slices which we examine later are approximate solutions. Slope stability for the analysis of the stability of slopes of arbitrary shape and composition various approximate methods have been developed. Methods of slope stability analysis o limit equilibrium method o limit analysis method o numerical methods we will consider only the limit equilibrium method, since it is the oldest and the mostly used method in practice. The simplest problem of slope stability that we can analyze, and that we should understand in detail because it is so basic, is that of the stability of the socalled infinite slope. Rock slope stability analysis ubc eoas university of british.
Salunkhe and others published an overview on methods for slope stability analysis find, read and cite all the research. An overview on methods for slope stability analysis. Comparing with the result obtained through the limit equilibrium method, the presented method was proved to be more accurate and suitable for stability analysis of rock slope with a thin shear plane. The method of stability analysis used see section 6. The moment is then calculated about the center of the trial surface. Slope stability analysis by the limit equilibrium method. Slope stability analysis manual calculations applied and. The block is considered to undergoes slippage along the plane for the value of. Unfortunately, back in 1974 slope sur face stabilization techniques were not fol. The quantitative determination of the stability of slopes is necessary in a number of engineering activities, such as.
The stability of a potentially unstable rock slope was analyzed based on the presented method. How do friction and cohesion work together to stabilize slopes. Using shear strength reduction method for 2d and 3d slope stability analysis thamer yacoub, ph. Most slope stability analysis computer programs are based on the limit equilibrium concept for a twoor threedimensional model. The common methods for the analysis of a slope s stability are culmann method, ordinary method of slices and bishop method of slices. Conventional methods of slope stability analysis can be divided into three groups. Various methods are available for slope stability analysis. The factor of safety equations are written in the same form, recognizing whether moment and or force equilibrium is explicitly satisfied. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. Slope stability analysis by the limit equilibrium method books. Toronto, canada annual kansas city geotechnical conference 2016. Morgenstern and prices method therefore poses a slope stability analysis as a statically determinate problem. Determination of the critical slip surface in slope. Application of the finite element method to slope stability.
This study also involves seismic stability analysis of the slope using pseudo static method. This is in part because stability is obviously a key issue in any project will the structure remain stable or collapse. Comparative approaches to probabilistic finite element. The normal force equation is of the same form for all methods with the exception of the ordinary method. Advanced numerical techniques in rock slope stability analysis applications and limitations pdf, davos, switzerland. Pdf slope stability analysis methods danial salajegheh. Stability analysis method for rock slope with an irregular. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. How does the slope angle play a role in slope stability. Slope stability causes of instability, analysis methods. Detailed pieziometric data at multiple locations and depths within and below the slope. These methods differ in simplifications and accuracy. Slope stability evaluations by limit equilibrium and.
Most textbooks on soil mechanics include several methods of slope stability analysis. An overview on methods for slope stability analysis ijert. Thus, the pseudostatic slope stability procedure is a potentially attractive design tool. Analysis of infinite slope with completely submerged slope if the slope is completely submerged, and if there is no seepage as in fig. Pdf numerical methods in analysis of slope stability. Slope stability analysis spreadsheet laobing kaisuo. 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. Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis detailed assessment of the groundwater regime within and beneath the slope is also critical. Although a number of numerical methods may be incorporated within the finite element technique, output factor of safety and probability of failure distributions can be dissimilar and method. Conclusions for the practical use of the finite element method are also given. Slope, a limit equilibrium slope stability analysis program, was used.
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 value. If moment equilibrium is not satisfied with that 32 slope stability analysis methods specific factor of safety based on the force equilibrium, repeat the step with the next factor of safety in checking the moment equilibrium. Using shear strength reduction method for 2d and 3d slope. Influence of logging on slope stability root cohesion 0 5 10 15 20 25 30 years after logging. Numerical analyses methods are the most common ones that are used for rock and soil slope analyses. Assumptions of stability analysis o the problem is considered in twodimensions. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. Even to this day, stability analyses are by far the most common type of numerical analysis in geotechnical engineering. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. The referenced june,2000 letter also acknowledged receipt of a proposal dated june 2, 2000, prepared by scs engineers that recommended an appropriate method to determine slope stability. 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. Related posts of spreadsheet for slope stability analysis. Criteria are presented for strength tests, analysis conditions, and factors of safety. To study the suitability of each method for particular soil type and slope condition with factor of safety.
Moreover, these simultaneous equations are highly nonlinear, the numerical solution is quite tedious, and frequently numerical divergence may be encountered. Conventional methods of slope stability analysis can be divided into three. This offers a number of methods but, for each analysis, the bishop method was applied for ease of comparison with the fe analysis. For a problem involving n slices, 3n equations have to be solved.
Outline slope stability analysis using limit equilibrium method lem vs. 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. Importance of slope stability problem is the reason why so many alternate methods have been developed for evaluating the safety of a slope. Lisa and xstabl have become standard analysis tools for resource planning level and sitespecific slope stability assessments, respectively, on national forests in. The degree of confidence in the reliability of subsurface data. One of the softwares that can analyze rock slope stability in a nu. The basic approach is determining a factor of safety against failure by sliding for a given slope. The slope stability analysis was performed using the simplified bishop method of slices to discretize the soil mass to establish the minimum factor of safety of the slope. To help change this situation this paper will compare the method s performance to those of the most widely used limitequilibrium methods on a broad range of slope.
The slope stability analysis is crucial in engineering practice to ensure the stability of structures and prevent loss of human life and money. The pseudostatic slope stability method has been shown to provide reasonable results for earth structures and natural slopes composed of and built atop materials that do not undergo severe strength loss as a result of earthquake shaking. Pdf an overview on methods for slope stability analysis. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Determination of the critical slip surface in slope stability analysis. Today, there are several methods for slope stability analysis, each has its own advantages and disadvantages. Stability analysis lisa, stability analysis for road access sara, the level i1 program, and xstabl the level 111 program. The steep slope in zone 1 necessitated safety ropes. Introduction slope stability analysis is an important area in geotechnical engineering. The method of sarma is a simple, but accurate method for the analysis of slope stability, which allows to determine the horizontal seismic acceleration required so that the mass of soil, delimited by the sliding surface and by the topographic profile, reaches the limit equilibrium state critical acceleration k c and, at the same time, allows. This method of slope stability analysis is not widely used since it has been found that plane surfaces of sliding are observed only with very steep slopes, and for. Probabilistic slope stability analysis methods are often necessary for evaluating soil variability and uncertainty. Using a number of simplifying assumptions a value for the safety factor f, the ratio of strength and load, is determined.
Slope stability evaluations by le and fe methods iii instability of natural and built. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Slope stability analysis limit equilibrium or the finite. Free download slope stability analysis spreadsheet, method of slices slope stability analysis, slope stability analysis software free download, slope stability analysis examples, ordinary method of slices spreadsheet, slope stability analysis methods pdf, factor of safety calculation for slope stability, swedish method of slices example, slope analysis pdf, incoming search terms. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo.
Application note slope stability analysis worked example. Methods for jointed rock slope stability analysis span a very wide range in the simplest form. An overall stability situation is where there is loss of overall stability of the ground and associated structures, i. Spreadsheet for slope stability analysis spreadsheets. Trevor orr trinity college dublin convenor tc250sc7eg3. Planar failure analysis a block is rest on a slope having angle. The most common engineering methods for analyzing slope stability are the limit equilibrium method or method of slices, and the finite element method, using a strength reduction factor bri 04. Limit equilibrium method plane failure analysis wedge failure analysis toppling failure analysis. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. A set of 5 basic slope stability problems, together with 5 variants, was distributed in the australian geomechanics profession and overseas as part of a survey sponsored by acads.