Determination of slope safety factor with analytical. Mathematical expressions for the circular arc method of. This estimate can aid in directing the drilling, sampling, and testing program while the drill crew is at the site and help. Mathematical expressions for the circular arc method of stability analysis richard e. This method of slope stability analysis is based on the assumption that the plane of failure is in the form of a circular arc. 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. This offers a number of methods but, for each analysis, the bishop method was applied for ease of comparison with the fe analysis. What are the resulting factors of safety bishop, spencer, janbu corrected and janbu simplified. 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. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. It allows either method to be applied to circular, composite, and non circular.
Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Slope stability modul for analytical solution for several analysis method bishop, spencer, janbu, sarma, itfm. I do slope stability analysis for the mining industry and mainly use two, 2d limit equilibrium analysis programs. 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 methodology is based on the calculation of the safety factor in 2d and 3d using arcgis. As an everyday engineering tool, slope software is quick and easy to use for a wide range of slope stability. 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. In geotechnical engineering series slope stability, youll learn. The complete analysis requires that a large number of assumed failure surfaces be checked in order to find the critical one, i. The slope stability analysis of embankment and foundation soil was conducted using the slope w component of geostudio software geo slope. Soil slope stability analysis using the friction circle method programmed in excel. Courses soil mechanics slope stability circular arc failure of slope analysis introduction on circular arc failure of slope analysis.
The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. 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. The basic software module deals with unreinforced slope analysis using bishops simplified method and circular slip surfaces. In 1916, petterson 1955 presented the stability analysis of the stigberg quay in gothenberg. Bishop circular slip surface geo5 online help fine software. Slide2 can be used for all types of soil and rock slopes, embankments, earth dams, and retaining walls.
Slope stability verification manual deep excavation llc page 11 e. Established slope stability analysis methods cope well with moderately noncircular. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Soil and water engineering modeling software slope stability software xstabl xstabl v5 an integrated slope stability analysis program for personal computers description of xstabl. Which one would be the best suited for the soil slope. Cads reslope is a leading slope stability software package for calculating the factor of safety of earth slopes. The software can be used with the vj tech ring shear.
The method of stability analysis used see section 6. 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. Determination of the critical slip surface in slope stability. Slide2 includes builtin finite element groundwater seepage analysis, probabilistic analysis, multiscenario modeling, and support design. Discuss slope stability circular and block analyses.
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. 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. Swedish circle method for pseudodynamic analysis of slope considering circular failure mechanism. The name geostase is an acronym for general equilibrium options for stability analysis of slopes and embankments. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability. Slope stability causes of instability, analysis methods. There are several available methods that can be used to perform a circular arc stability analysis for an approach embankment over soft ground. In some circumstances, failure will occur in a predominantly horizontal direction. Slope stability wizard geometry section soil name material drainage behaviour c u c 0. 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. In this study, geo5, slope w and flac slope software programs were used to analyze the slope stability problems.
The user interface and analysis options are almost identical to the generalised slope analys is. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. In this study, the surface of noncircular arc failure logarithmic spiral has. It performs twodimensional slope stability analysis using the method of slices and presents the results in a clear graphical format. What is the best software to analyse the slope stability. 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.
You can also apply partial factors, including ec7, with ease. Slope stability demonstration 1 slope stability demonstration this document describes the stability analysis of a proposed soil slope using slide 5. 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. Slope stability analysis is applied by twodimensional 2d and threedimensional 3d analyses. The four major types of instability that should be considered in the design of embankments over weak foundation soils. Slopew can effectively analyze both simple and complex problems for a variety of slip. The basics of slope stability analysis for geosynthetics. Circular arc failure in embankment fill and foundation soil, c sliding block failure in. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. 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. 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. 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.
Generalised non circular slip analysis slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma non circular slip. Slope stability software geotechnical engineering 101 and more. 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 safety factor and failure circle determination program developed in. Introduction on circular arc failure of slope analysis. On the other hand, flac slope usually gives out greater value for factor of safety compared to slope w and geo5. Slope, a limit equilibrium slope stability analysis program, was used. The paper presents a slope stability analysis of a proposed embankment contained. Is there any free software available for slope stability. The exported data includes elements such as connection strength thus facilitating a more comprehensive stability analysis. Slope stability analysis limit equilibrium or the finite.
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. The software in general is very good and ties in well with the way we do things here. 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. Hu junjuan school of civil engineering and architecture, zhejiang university of science and technology abstract. Geostase is a 2d limit equilibrium slope stability analysis software program developed by dr. The concept of the twodimensional circular arc method of stability analysis is extended to threedimensional slope stability problems. 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. Application note slope stability analysis worked example figure 2. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. The trial slip surface starts as an arc of the circle until it intersects the.
Soil slope stability analysis using the friction circle. 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. Determination of the critical slip surface in slope. Consequently, slope stability software became available. Using the finite element analysis method and the autorefine search method in slide, run the groundwater and slope stability analysis on the model. 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. Slope stability analysis of soil slopes using the nonvertical slice method proposed by sarma noncircular slip. The program uses bishops modified method and janbus simplified method. Global slope failure has been commonly observed to follow the arc of a circle.
I need software to calculate the factor of safety and carry out a kinematic analysis for different landslide types. The basic software module deals with unreinforced slope analysis using bishops simplified method and circular. The software slopew is used to investigate the slope stability and to. Most techniques for stability analysis operate on the assumption of a circular failure arc.
In this study, geo5, slope w and flac slope software programs were used to analyze the slope stability. Xstabl provides an integrated environment for performing slope stability. Ge, principal consultant with gregory geotechnical gregeo. The assumed 2d slope failure surface is circular determined by two variables x c and x cc in figure 2. Determination of slope safety factor with analytical solution. Article the basics of slope stability analysis for geosynthetics. Venkatachalam, department of civil engineering, iit bombay. 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. Circular arc stability analysis ordinary method of slices o firm soft firm slip surface fill. The exported data includes elements such as connection strength thus facilitating a more comprehensive stability analysis for which ressa is ideal. It is a practical method for the evaluation of the shortterm stability of saturated clay slopes. 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. Critical failure surface, factor of safety, length of failure arc, limit.
Determination of the critical slip surface in slope stability analysis. Most slope stability analysis computer programs are based on the limit equilibrium concept for a twoor threedimensional model. 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. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Is there any free software available for slope stability analysis. Daily or intermediate cover was not taken into account in the slope stability analysis.
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. Generally, there are a numbers of on the shelf slope stability analysis software available in the market. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. For more indepth and efficient global analysis, msew3. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. 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. Apr, 2015 this is because in the analysis of a dry slope the total and effective stresses are the same. The software program galena was used as a modeling tool for the slope stability.
The graphics and the pointandclick data input are also very good and makes the program very easy to use. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Prediction of the sliding type and critical factor of safety in. 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. To propose a method to improve ground stability at maran highway slope. 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. For this reason, the slope stability analyses are usually performed using computer programs that implement one or more methods. The analysis is only concerned with the values of c. What is the best software to analyse the slope stability there are different research software are there to analyses the slope stability. 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.
Jan 04, 2007 choice of slope stability software is very personal. Application note slope stability analysis worked example. Rotational failure mechanism of undrained clay slopes was analyzed by. Slide2 most comprehensive 2d slope stability software. 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. Slope stability analysis based on realtime displacement. Slide2 is a powerful, userfriendly, 2d slope stability analysis program using limit equilibrium method. 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. Determination of slope safety factor with analytical solution and. You can also apply partial factors, including ec7, with. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate.
Spreadsheet for slope stability analysis spreadsheets. Side slope stability analysis the primary aim of slope analysis is to compare the stability of selected 1. The analytical solution is more accurate than fellenius slices method. X c is the abscissa of a point on slope top surface. Stability of slopes of municipal solid waste landfills with.
Conventional methods of slope stability analysis can be divided into three groups. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. This study helps us understand slope stability, it analysis. 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. To produce slope stability analysis for maran highway slope using slope w software. Slope stability analysis is vital to preventing slope failures in a variety of engineering applications including landfill design, roads. Sliding surface searching method for slopes containing a. The commercial limit equilibrium programs all do the basics i. The slope stability analysis was conducted using the software slope w. Application note slope stability analysis worked example 4. 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.
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