Authors giorgia fulcheri dewolfe, bureau of reclamation, 8668311, denver co 5d. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. The manuscript describes the constitutive laws of material behaviour such as. The majority of slope stability analyses performed in practice still use. Adonis a free finite element program for slope stability. Application of the finite element method to slope stability. Upper bound limit analysis of slope stability using rigid. Prev next slope stability analysis by finite elements authors. Slope stability analysis with the finite element method. Probabilistic slope stability analysis using the random. Aided design the university of iowa iowa city, iowa usa th iowa asce geotech. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools. The stability analysis is of a homogeneous slope subjected to a horizontal acceleration factor. Nonlinear finite element models using elasticperfectly plastic material strength formulations have been used to determine factors of safety.
Slope stability analysis by finite elements pdf download. Slope stability represents an area of geotechnical analysis in which finite element method provides a lot of benefits over limit equilibrium. The example to be analyzed is a simple homogeneous slope shown in fig. These examples will be analyzed by the finite element method and will be compared with the limit equilibrium methods. Specifically, a slope with a soft weak material band, a postquake slope, and rock slopes were investigated. Finite element analysis of slope stability using a. 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. Despite the ssr finite element techniques many benefits, it has not received widespread adoption among geotechnical engineers for routine slope stability analysis. The finite element method is shown to be particularly useful for showing how failure. Slope stability analysis based on the coupled eulerian. Limit equilibrium slope stability analysis using rigid finite elements. Slope stability analysis with finite element method.
In this paper, the development and application of a new upper bound limit method for two and threedimensional 2d and 3d slope stability problems is presented. It performs twodimensional slope stability analysis using the method of slices and presents the results in a clear graphical format. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. Slope stability analysis based on the finite element method fem is a powerful tool compared with the limit equilibrium lem methods. Application of the finite element method to slope stability rocscience inc. Slope stability, limit analysis, plasticity, rigid finite element method, linear programming. The term landslide refers to a situation of instability affecting natural slopes and involving large. Analysis of infinite slope with completely submerged slope if the slope is completely submerged, and if there is no seepage as in fig. Comparative study of slope stability analysis using. Finite element analysis of failed slope by shear strength. Comparative approaches to probabilistic finite element. Includes recommendations for analysis, design practice, design charts, tables, and more. Threedimensional slope stability analysis by elastoplastic finite elements article pdf available in geotechnique 576.
Stability of open pit slope depends on geometry of slope, rock mass characteristics and shear strength behaviour of the joints 1. When coupled with other geoslope software products, it can also model the porewater pressure generation and dissipation in a soil. The use of the slip circle in the stability analysis. The advantage of a finite element approach in the analysis of slope stability. Finite element analyses of slope stability problems using.
The limit equilibrium method contains several limitations and inconsistencies, yet is considered the most common approach. Determining slope stability by rigid finite element method. In this study, a slope stability analysis method based on the. However the minimum constructive elements provided in the program do not allow the software to perform analysis for complex cases. In this paper, the development and application of a new upper bound limit method for two and threedimensional 2d and 3d slope stability problems is. Pdf slope stability analysis by finite elements researchgate. The study on slope stability analysis based on finite. Slope stability analysis using finite element techniques. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. Xflr5 includes the xfoil program for foil analysis, and several 3d analysis methods for planes.
An important orginal point in the proposed method is that the slope failure is defined according to the shear strain failure criterion. In srfea, the mesh refinement is performed manually with 15noded triangular elements. Slope stability analysis using finite element techniques colby c. Slope stability analysis by finite elements geotechnique. Limit equilibrium slope stability analysis using rigid. Finite element methods against limit equilibrium approaches for slope stability analysis. The limit equilibrium method is commonly used for slope stability analysis, being relatively simple compared with finite element analysis. Upper bound limit analysis of slope stability using rigid finite elements and nonlinear programming jian chen, jianhua yin, and c.
Slope stability analysis by finite elements pdf download 157q5z. This video will help the user understand the workflow in gts nx and plaxis for a simple 2d slope stability analysis. Probabilistic slope stability analysis by finite elements d. The source code for slope64 is written in fortran 2003, but users are provided with the executable file slope64. The shear strength reduction option in adonis allows you to automatically perform a finite element slope stability analysis, and compute the factor of safety of the slope. Stability analysis of slopes using the finite element method and.
An obvious drawback with the traditional fembased limit analysis approaches being. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. A comparison of results is made for both the software. However, mesh distortion of the traditional lagrangian fem may result in convergence difficulty of numerical simulation, and the obtained factor of safety fos of the slope is not reliable. It is argued that the finite element method of slope stability analysis is a more powerful alternative to. It can be used mainly for preliminary analysis of slopes since it can provide an estimate of the factor of safety with minimum effort from the user. Slope stability analysis of steep reinforced soil slopes. Introduction the finite element method fem based on limit analysis is a conventional method in analyzing the limit state issues for various researchers. It combines strength reduction technology with the finite element method to gain the minimum safety coefficient of slope by adjusting the reduction factor to analyses the stability of slope under the given evaluation indicators. The aim of this paper is to verify the shear strength reduction technique for the finite element slope stability analysis. Probabilistic slope stability analysis using the random finite element method rfemreport of findings 5a. Finite element analysis of failed slope of the surabhi resort landslide located in.
It is found that the results of the two methods are almost the same. Slope stability analysis is an important area in geotechnical engineering. An overview on methods for slope stability analysis. Toronto, 20012004 this document outlines the capabilities of the finite element method in the analysis of slope stability problems. 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. New methods and insight, second edition provides helpful practical advice and design resources for the practicing engineer.
The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. 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. For example, you can perform a simple linear elastic deformation analysis or a highly sophisticated nonlinear elasticplastic effective stress analysis. Emphasis is made on the definition of two different stability numbers. Slope stability analysis based on random finite element method and probabilistic approach 6 list of tables table 1 possible range of slope heights for different slope angles according to taylors method38 table 2 overview of the total parameter set including slope gradient. Simslope stands for simplified slope stability analysis software. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. 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 expediently choose the.
Slope stability analysis based on random finite element. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Stability analysis of rock slopes using the finite element. The finite element method has become one of the prevailing tools for numerical analysis of slope stability, requiring few a priori assumptions, especially regarding the slope failure mechanism 45, 46. Comparison study between traditional and finite element methods. Probabilistic slope stability analysis by finite elements. Conclusions for the practical use of the finite element method are also given. Slope stability analysis by finite elements open pdf. In this paper, the authors apply a finite element code, plaxis, on slope stability analysis with various conditions to state out sensitivities of not only the soil parameters, slope configuration and groundwater condition but also numerical condition. Pdf the majority of slope stability analyses performed in practice still use traditional limit.
Numerical solutions in which failure mechanisms can also be estimated are favorably compared to those obtained using limit analysis and limit equilibrium approach. This paper utilizes finiteelement limitanalysis methods to investigate the stability of slopes of various properties and in nature. Slopestability assessments using finiteelement limit. 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. You can also apply partial factors, including ec7, with. Slope stability evaluations by limit equilibrium and. It is argued that the finite element method of slope stability analysis is a more.
Analysis of embankment slope stability based on the. 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 the limit equilibrium method. The paper presents results of unsaturated slope stability analyses using elasto. Lane, slope stability analysis by finite elements, geotechnique, 493. Pdf threedimensional slope stability analysis by elasto. Strength reduction finite element method24 is an extensive numerical analysis method in slope stability analysis.
These programs include the limit equilibrium le and finite element fe methods of slope stability 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. On the assessment of failure in slope stability analysis. Nonlinear shear strength criteria of powerlaw type are implemented in a finite element slope stability analysis. Slope stability evaluation for the new railway embankment. Slope stability analysis in that paper they conclude a methodology of slope stability analysis and provide an insight into the basic of constant affected by change in relationship for shearing stress and resistance. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. A slope is studied with limiting equilibrium method and finite element method comparatively. Slope stability examples in this section, five examples of slope stability analysis from griffiths and lane 1999 will be discussed.