Some of the advantages of finite element approach over the limit equilibrium methods in the analysis of slope stability problems were given by griffiths and lane, 1999 3. The elastoplastic finite element slope stability method makes no a priori assumptions about the. Application of the finite element method to slope stability rocscience inc. To study the factor of safety, two different approaches applying the socalled c.
Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. One of the softwares that can analyze rock slope stability in a nu. Finite element analysis of rock slope stability using. Finite element analysis incorporating the shear strength reduction method was applied to study the west slope stability of an open cut mine in australia using mohrcoulomb and generalized hoekbrown criteria. Using a unified approach to address a medley of engineering and construction problems, slope stability analysis and stabilization. Ultimately, it should be noted that finite element limit analysis method holds the upper hand as its prior assumptions are not required. It may help to make a copy of one of the example data files closest to your own problem and edit that as needed. An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls using finite elements and.
A sound theoretical basis, a generalized approach that is capable of handling field conditions, and simplicity, are some of the requirements of a handy slope stability method. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams. Contact the authors the hku scholars hub has contact details for these authors. Several slopes are analyzed with the finite element. Slope stability analysis by finite elements pdf download. Slope stability analysis by finite elements colorado school of mines.
Usually in these adaptations, the finite element method. Stability charts for pseudostatic stability analysis of 3d. Toronto, 20012004 this document outlines the capabilities of the finite element method in the analysis of slope stability problems. Finite element reliability analysis of slope stability. Analysis of slope stability using finite element method mohd yusri bin suratman this thesis is submitted to faculty of engineering, universiti malaysia sarawak in fulfillment of the requirements for the award of the degree of bachelor of engineering with honours civil engineering 2009. The distribution of principal stress, maximal plastic strain, plastic zone, lateral displacement, vertical settlement and incremental of displacement can be investigated by fem effectively, which make it easy to. Threedimensional slope stability model using finite. Probabilistic slope stability analysis by finite elements. In ssr technique, it is assumed that slope materials have elastoplastic. Stability of open pit slope depends on geometry of slope, rock mass characteristics and shear strength behaviour of the joints 1. Slope stability analysis for filled slopes using finite. An obvious drawback with the traditional fembased limit analysis approaches being. This paper uses the modified strength reduction finite element method to propose stability charts for pseudostatic stability analysis of threedimensional 3d homogeneous soil slopes subjected to seismic excitation. Application of the finite element method to slope stability.
This report explains the layout of data for use with. The authors have presented various numerical comparisons of the safety factor of slopes between the finite element method fem and limit. The influence of local averaging on the probability of failure of a test problem is thoroughly investigated. Slope stability analysis with finite element method. Slope, a limit equilibrium slope stability analysis program, was used. This offers a number of methods but, for each analysis, the bishop method was applied for ease of comparison with the fe analysis. It appears that if a practical threedimensional finite element tool for. The majority of slope stability analyses performed in practice still use traditional limit equilibrium approaches involving methods of slices that. Stability analysis of slopes with surcharge by lem and fem international journal of advanced structures and geotechnical engineering issn 23195347, vol. Slope stability analysis by means of finite element limit. The finite element method represents a powerful alternative approach for slope stability analysis which is accurate, versatile and requires fewer a priori assumptions, especially, regarding the failure mechanism.
In this paper, a numerical study for stability of 80 m high internal dump slopes from an opencast coal mine of wardha valley coal field, maharashtra, india has been carried out using finite element method fem. Read analysis of a nailed soil slope using limit equilibrium and finite element methods, international journal of geosynthetics and ground engineering on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Probabilistic slope stability analysis by finite elements d. 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. Numerical solutions in which failure mechanisms can also be estimated are favorably compared to those obtained using limit analysis and limit equilibrium approach. The use of the finite elements in calculations of stability has to overcome the weakness of the traditional methods. The stability of the gully erosion slopes in this work is analyzed using. Application note slope stability analysis worked example. Geoslope international ltd, calgary, alberta, canada. Using shear strength reduction method for 2d and 3d slope. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools.
A comparison of results is made for both the software. These charts are developed in a wide range of input parameters for purely cohesive slopes and cohesivefrictional slopes, respectively. Specifically, a slope with a soft weak material band, a postquake slope, and rock slopes were investigated. This paper presented an analysis method for slope safety factor through shear strength reduction. Slope stability analysis limit equilibrium or the finite. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. The majority of slope stability analyses performed in practice still use. The plane strain model of 15node elements was used in the analysis.
The safety factor of slope is defined as the factor by which the original shear. A slope is studied with limiting equilibrium method and finite element method comparatively. Strength reduction stability geoslope international. Despite the ssr finite element techniques many benefits, it has not received widespread adoption among geotechnical engineers for routine slope stability analysis. These programs include the limit equilibrium le and finite element fe methods of slope stability analysis. Aided design the university of iowa iowa city, iowa usa th iowa asce geotech. Slope stability analysis of steep reinforced soil slopes using finite element method animesh sharma1 1geotechnical engineer. Slope stability analysis using finite element techniques. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Finite element analysis of failed slope by shear strength. Slope stability analysis using finite element techniques colby c. The pit of the mine had multiphase excavations and reached 180 m in depth. Dis file from pfslope showing displacement associated with the.
Finite element method of stability analysis and stabilization. Introduction the finite element method fem based on limit analysis is a conventional method in analyzing the limit state issues for various researchers. This text examines a range of current methods for the analysis and design of slopes, and. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Upper bound limit analysis of slope stability using rigid finite elements and nonlinear programming. It is argued that the finite element method of slope stability analysis is a more powerful alternative to traditional limit equilibrium methods and its widespread use should now be standard in geotechnical practice. Using shear strength reduction method for 2d and 3d slope stability analysis thamer yacoub, ph. Nonlinear shear strength criteria of powerlaw type are implemented in a finite element slope stability analysis. It is found that the results of the two methods are almost the same. The manuscript describes the constitutive laws of material behaviour such as. It is argued that the finite element method of slope stability analysis is a more.
Stability analysis of slopes with surcharge by lem and fem. This paper utilizes finiteelement limitanalysis methods to investigate the stability of slopes of various properties and in nature. This paper deals with a back analysis of a slope failure. Slope stability analysis of steep reinforced soil slopes. Slope stability evaluations by limit equilibrium and finite element methods trondheim, april 2006 thesis submitted to the faculty of engineering science and technology, norwegian university of science and technology in partial fulfilments of the requirements for the degree of philosophiae doctor in civil engineering. Slope stability analysis by finite elements pdf download 157q5z. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Stability of slope and seepage analysis in earth dam using. Slope stability evaluation for the new railway embankment. It has certain limitations and inherent dangers of failures posing operational and safety threats. Slope stability analysis by finite elements geotechnique. Probabilistic slope stability analysis using the random.
New methods and insight, second edition provides helpful practical advice and design resources for the practicing engineer. However, numerical analysis are based on complex mathematical theories to reach a result which with the new advances in technology as more accessible softwares, friendlier userinterfaces, and faster computers, specialized. Slopestability assessments using finiteelement limit. Graphical output is included to illustrate deformations and mechanisms of failure. The case history investigated is located in an alpine environment in central europe and is characterized by a very steep original terrain, indicating in situ soil with high strength. Probabilistic slope stability analysis using the random finite element method rfemreport of findings.
An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls us ing finite elements and limit equilibrium methods. Numerical analyses methods are the most common ones that are used for rock and soil slope analyses. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. The sarma method is a method used primarily to assess the stability of soil slopes under seismic conditions. Slope stability, limit analysis, plasticity, rigid finite element method, linear programming. The limit state function that can consider the direction of slip surface is given, and the formulations of fera based on incremental tangent stiffness method and modified aitken accelerating algorithm are. It also discusses advanced topics such as strength reduction techniques and the definition of slope collapse. Pdf slope stability analysis by finite elements researchgate. Finite element analysis of slope stability using a. The method of nonlinear finite element reliability analysis fera of slope stability using the technique of slip surface stress analysis ssa is studied. This video will help the user understand the workflow in gts nx and plaxis for a simple 2d slope stability analysis.
Using appropriate assumptions the method can also be employed for static slope stability analysis. Design of overall slope angle and analysis of rock slope. Slope stability evaluations by limit equilibrium and. Thus, the obtained failure mechanism from the slope stability analysis will be more realistic. Geomechanics research center colorado school of mines. 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. Pdf the majority of slope stability analyses performed in practice still use traditional limit equilibrium approaches involving methods of slices. 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. Slope stability analysis limit equilibrium or the finite element. The manuscript describes the constitutive laws of material behaviour such as the mohrcoulomb failure criterion, and material properties input parameters, required to adequately model slope failure. Slope stability analysis slope stability analysis stabilizing a slope using antislide piles stabilizing a slope using antislide piles inputting geometry by importing data from a dxf file inputting geometry by importing data from a dxf file using standards and analysis settings using standards and analysis settings importing data in txt format.
Slope failure in the finite element model occurs naturally through the zones in which. The limit equilibrium method contains several limitations and inconsistencies, yet is considered the most common approach. In the simple approach, classical slope stability analysis. Determining slope stability by rigid finite element method. Sarma in the early 1970s as an improvement over the other conventional methods of analysis which had adopted numerous simplifying. Lanethe majority of slope stability analyses performed in practice still use traditional limit.
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