Application note slope stability analysis worked example 4. Determination of slope safety factor with analytical solution. Venkatachalam, department of civil engineering, iit bombay. Application note slope stability analysis worked example. May 06, 2011 slope and dump stability, diffent slope failures, factora affecting slope stanbility, analysis of slope stability, monitoring of slopes, stabilisation of slopes slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Slopew can effectively analyze both simple and complex problems for a variety of slip. What are the resulting factors of safety bishop, spencer, janbu corrected and janbu simplified. Slope stability analysis limit equilibrium or the finite. The method of stability analysis used see section 6.
The slope stability analysis was conducted using the software slope w. 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 limit. Side slope stability analysis the primary aim of slope analysis is to compare the stability of selected 1. Generally, there are a numbers of on the shelf slope stability analysis software available in the market. The exported data includes elements such as connection strength thus facilitating a more comprehensive stability analysis for which ressa is ideal. The basic software module deals with unreinforced slope analysis using bishops simplified method and circular slip surfaces.
Sliding surface searching method for slopes containing a. Courses soil mechanics slope stability circular arc failure of slope analysis introduction on circular arc failure of slope analysis. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Conventional methods of slope stability analysis can be divided into three groups. You can also apply partial factors, including ec7, with. Determination of the critical slip surface in slope stability. Xstabl provides an integrated environment for performing slope stability. The concept of the twodimensional circular arc method of stability analysis is extended to threedimensional slope stability problems. The stepbystep procedure presented in the circular arc failure of slope analysis article illustrates how to compute the factor of safety for one selected circular arc failure surface. Determination of slope safety factor with analytical.
The analytical solution is more accurate than fellenius slices method. Mathematical expressions for the circular arc method of. Stability of slopes of municipal solid waste landfills with. The software can be used with the vj tech ring shear. The trial slip surface starts as an arc of the circle until it intersects the. Swedish circle method for pseudodynamic analysis of slope considering circular failure mechanism. The slope safety factor obtained by the slope stability analysis method has roughly the same value and change in trend as that calculated by the bishop method. In geotechnical engineering series slope stability, youll learn. Hu junjuan school of civil engineering and architecture, zhejiang university of science and technology abstract.
The commercial limit equilibrium programs all do the basics i. Introduction on circular arc failure of slope analysis. Slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma noncircular slip. The basic software module deals with unreinforced slope analysis using bishops simplified method and circular.
This study helps us understand slope stability, it analysis. Slope stability analysis is applied by twodimensional 2d and threedimensional 3d analyses. Apr, 2015 this is because in the analysis of a dry slope the total and effective stresses are the same. Cads reslope is a leading slope stability software package for calculating the factor of safety of earth slopes in accordance with both the eurocodes and british standards the basic software module deals with unreinforced slope analysis using bishops simplified method and circular. Slope stability analysis is vital to preventing slope failures in a variety of engineering applications including landfill design, roads.
Determination of slope safety factor with analytical solution and. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability. The effects of water on slope stability circular arc stability analysis methods how to estimate factors of safety using slope stability charts, the ordinary method of slices and alternate. This offers a number of methods but, for each analysis, the bishop method was applied for ease of comparison with the fe analysis. The first one is to find out the position of the slope potential sliding surface, and the second is to analyze the slope stability in these surfaces. On the other hand, flac slope usually gives out greater value for factor of safety compared to slope w and geo5. The software in general is very good and ties in well with the way we do things here. Is there any free software available for slope stability. In this study, geo5, slope w and flac slope software programs were used to analyze the slope stability problems. Soil slope stability analysis using the friction circle. There are several available methods that can be used to perform a circular arc stability analysis for an approach embankment over soft ground. Although, all of them are capable to analyze the stability of slope, their user friendliness and the accuracy of the result will varies from each other.
Rotational failure mechanism of undrained clay slopes was analyzed by. Discuss slope stability circular and block analyses. To produce slope stability analysis for maran highway slope using slope w software. To propose a method to improve ground stability at maran highway slope.
The software program galena was used as a modeling tool for the slope stability. Slope provides an easy and accurate way to study a slip surface to find factors of safety against failure, and to check the improvements from reinforcement. For this reason, the slope stability analyses are usually performed using computer programs that implement one or more methods. Slope stability demonstration 1 slope stability demonstration this document describes the stability analysis of a proposed soil slope using slide 5. The exported data includes elements such as connection strength thus facilitating a more comprehensive stability analysis. Slope stability wizard geometry section soil name material drainage behaviour c u c 0. If x c is determined, the 2d critical slip surface circle center with abscissa x cc must lie on the perpendicular bisector of the straight line from the point of x c to the slope. Gslope carries out limit equilibrium slope stability analysis of existing natural slopes, unreinforced manmade slopes, or slopes with soil reinforcement. 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. Jan 04, 2007 choice of slope stability software is very personal. Most slope stability analysis computer programs are based on the limit equilibrium concept for a twoor threedimensional model.
Critical failure surface, factor of safety, length of failure arc, limit. The methodology is based on the calculation of the safety factor in 2d and 3d using arcgis. Slide2 is a powerful, userfriendly, 2d slope stability analysis program using limit equilibrium method. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. In slope stability analysis, it is clear that a threedimensional 3d situation may become important in cases where the geometry of the slope and slip surface varies significantly in the.
What is the best software to analyse the slope stability there are different research software are there to analyses the slope stability. In this study, geo5, slope w and flac slope software programs were used to analyze the slope stability. Slope, a limit equilibrium slope stability analysis program, was used. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. This proves that the safety factor obtained by the experiment is reasonable, and the slope stability analysis method based on realtime displacement measurement is viable. Cads reslope is a leading slope stability software package for calculating the factor of safety of earth slopes in accordance with both the eurocodes and british standards. 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 genetictraversal random method. The name geostase is an acronym for general equilibrium options for stability analysis of slopes and embankments. Different slope stability analysis software programs were used and compared, and a formula was presented to calculate the length of failure arc by knowing the soil strength parameters. Slope stability software geotechnical engineering 101 and more. Galena is one of the most powerful and flexible slope stability analysis systems available anywhere in the world, allowing you to analyse ground and slope stability quickly and accurately using models that simulate actual conditions galena is a simple, userfriendly yet very powerful slope stability software.
Prediction of the sliding type and critical factor of safety in. Generalised non circular slip analysis slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma non circular slip. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Established slope stability analysis methods cope well with moderately noncircular. Article the basics of slope stability analysis for geosynthetics. This estimate can aid in directing the drilling, sampling, and testing program while the drill crew is at the site and help. Is there any free software available for slope stability analysis. In this study, the surface of noncircular arc failure logarithmic spiral has. Soil slope stability analysis using the friction circle method programmed in excel. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. In 1916, petterson 1955 presented the stability analysis of the stigberg quay in gothenberg, sweden where the slip surface was taken to be circular and the sliding mass was divided into. The program uses bishops modified method and janbus simplified method. The user interface and analysis options are almost identical to the generalised slope analys is. Slope stability modul for analytical solution for several analysis method bishop, spencer, janbu, sarma, itfm.
Different slope stability analysis software programs were used and compared, and a formula was presented to calculate the length of failure arc by knowing the soil strength. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. Forces involved for the calculation of stability of slopes. Using the finite element analysis method and the autorefine search method in slide, run the groundwater and slope stability analysis on the model. Limit equilibrium methods are very common method and widely applied to slope stability analysis with various slope shapes and engineering geological conditions ni, 2004, shi and luan, 20. The complete analysis requires that a large number of assumed failure surfaces be checked in order to find the critical one, i.
Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. Slope stability verification manual deep excavation llc page 11 e. The global stability analysis is an iterative process where as many as 250 trial failure surfaces are assumed and analyzed to determine the critical failure surface i. What is the best software to analyse the slope stability.
Daily or intermediate cover was not taken into account in the slope stability analysis. I need software to calculate the factor of safety and carry out a kinematic analysis for different landslide types. The analysis is only concerned with the values of c. Spreadsheet for slope stability analysis spreadsheets.
The software slopew is used to investigate the slope stability and to. Determination of the critical slip surface in slope stability analysis. Slope stability analysis based on realtime displacement. Which one would be the best suited for the soil slope. The simplest basic method is known as the normal or ordinary method of slices, also known as fellenius method or the swedish circle method of analysis. Slide2 can be used for all types of soil and rock slopes, embankments, earth dams, and retaining walls. Bishop circular slip surface geo5 online help fine software.
The paper presents a slope stability analysis of a proposed embankment contained. X c is the abscissa of a point on slope top surface. 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 association for computer aided design, in 1988. This method of slope stability analysis is based on the assumption that the plane of failure is in the form of a circular arc. The slope stability analysis of embankment and foundation soil was conducted using the slope w component of geostudio software geo slope. I do slope stability analysis for the mining industry and mainly use two, 2d limit equilibrium analysis programs.
Ge, principal consultant with gregory geotechnical gregeo. 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. Geostase is a 2d limit equilibrium slope stability analysis software program developed by dr. The vj tech clisp studio ringhear software module enables the user to perform tests to determine the residual shear strength of cohesive soils, which is particularly important when assessing slope stability. The four major types of instability that should be considered in the design of embankments over weak foundation soils. Circular arc failure in embankment fill and foundation soil, c sliding block failure in. You can also apply partial factors, including ec7, with ease. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. In 1916, petterson 1955 presented the stability analysis of the stigberg quay in gothenberg. Consequently, slope stability software became available. The circular sliding surface, as a part of the combined sliding surface, is also ineffective when it intersects with weak structural plane and the node c of weak structural plane falls inside of the circle as shown in fig.
Slide2 formerly slide is a 2d slope stability program for evaluating the safety factor or probability of failure, of circular and non circular failure surfaces in soil or rock slopes. It is a practical method for the evaluation of the shortterm stability of saturated clay slopes. Application note slope stability analysis worked example figure 2. The graphics and the pointandclick data input are also very good and makes the program very easy to use. Slope stability causes of instability, analysis methods. In the current practice, to determine the safety factor of a slope with twodimensional 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. 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. The purpose of this course is to show the reader that slope stability design by friction circle theory can be easily and accurately calculated by pc computer using excel worksheets. 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. It performs twodimensional slope stability analysis using the method of slices and presents the results in a clear graphical format. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. The basics of slope stability analysis for geosynthetics.
Determination of the critical slip surface in slope. The assumed 2d slope failure surface is circular determined by two variables x c and x cc in figure 2. Slide2 most comprehensive 2d slope stability software. For more indepth and efficient global analysis, msew3.
Circular arc stability analysis ordinary method of slices o firm soft firm slip surface fill. The safety factor and failure circle determination program developed in. Global slope failure has been commonly observed to follow the arc of a circle. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. End effects on the stability of cohesive slopes due to failure along a finite length are evaluated by means of a computer program stab3d developed for this purpose. Most techniques for stability analysis operate on the assumption of a circular failure arc. As an everyday engineering tool, slope software is quick and easy to use for a wide range of slope stability. Mathematical expressions for the circular arc method of stability analysis richard e.
Slide2 includes builtin finite element groundwater seepage analysis, probabilistic analysis, multiscenario modeling, and support design. It allows either method to be applied to circular, composite, and non circular. In some circumstances, failure will occur in a predominantly horizontal direction. Cads reslope is a leading slope stability software package for calculating the factor of safety of earth slopes.
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