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. To overcome its shortcomings, this paper combined hoekbrown criterion and limit equilibrium method and proposed an equation for calculating the safety factor of slope. Forces acting on the n th column sitting on a stepped base. Slope stability analysis using the limit equilibrium method. Details name limit equilibrium methods of slope stability analysis fundamentals pages 31 format pdf size 5 mb download method direct download download. 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. Assessment of slope stability is using limit equilibrium method with comparing bishop, janbu, and spencer method using slide 6. Slope stability analysis by the limit equilibrium method. Most slope stability analysis computer programs are based on the limit equilibrium concept for a two or threedimensional model. Limit equilibrium methods of slope stability analysis. Equilibrium method an overview sciencedirect topics. To improve confidence in the ssr technique, this paper will compare the methods performance to those of wellestablished limitequilibrium methods on a broad range of slope cases. It considers a soil continuum of different strata, and given a particular failure surface in the form of lines or arcs, a factor of safety is found through. Oct 28, 2016 this paper aims at the two most common methods used for slope stability analysis.
The fact that the limit equilibrium method of slices is based on nothing more than statics often seems to be forgotten, and the. Analysis of a nailed soil slope using limit equilibrium and. The most common limit equilibrium techniques are methods of slices, such as the ordinary method of slices fellenius and the bishop simplified, spencer, and morgensternprice methods. In this study area is composed of clay with the firm to stff structure. Most methods of computing the fs for a failure surface can be. Reame has been changed to leame limit equilibrium analysis of multilayered earthworks in this book to reflect the capabilities of the software better. Slope stability limit equilibrium analysis 27 a general. 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, the limit equilibrium method is usually used to calculate the safety factor. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. In slope stability analysis, the limit equilibrium method is usually used to calculate the safety factor of slope based on mohrcoulomb criterion. The paper titled slope stability analysis using limit equilibrium method in nonlinear criterion 1, published in the scientific world journal, has been retracted upon the authors request as it. The proposed analysis, although based on the kinematical approach of limit analysis, always. Pdf slope stability analysis using limit equilibrium method. However, the stratified rock slope cannot be accurately estimated by this method because of different bedding planes and their variable shear strength parameters. Limit equilibrium analysis of the influence of matric suction on unsaturated soil slope stability li jinyu, yang qing, luan maotian influence of water content over soil strength through experiments and discuss how water content and matric suction influence unsaturated soil slope stability through limit equilibrium method. Pdf limit analysis versus limit equilibrium for slope stability. Hence, the le stress method is established to analyze the slope stability by employing the double strengthreduction dsr technique in this work. An attempt has been made to bring out the differences in results of reinforced slope stability analysis obtained from slopew limit equilibrium based and plaxis 2d finite element based.
Jul 23, 2014 while numerical methods consume long time to calculate the safety factor of the slope, for instance, when taking the cpu time required by each of the models on the same computer into consideration, limit equilibrium method ran considerably faster, taking about 2 minutes per run compared with 30 minutes and 7 hours using the coarse about 2000. The swedish method of slices for a cohesive frictional co soil adopted for general type of soil which have the combined grains of c and o soils. The authors dealt with a difficult project in northern peru involving a threedimensional 3d slope stability analysis of a mine waste dump. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. Slopew limit equilibrium software for slope stability analysis. Limit equilibrium analysis of the influence of matric suction. Limit equilibrium analysis for toppling failure model for limiting equilibrium analysis of toppling on a stepped base goodman and bray, 1976. Slope stability analysis using limit equilibrium method in nonlinear. While numerical methods consume long time to calculate the safety factor of the slope 18. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. 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. Slope stability analysis by the limit equilibrium method books. The fundamental feature of limit equilibrium method is only considering the static equilibrium. A limit equilibrium slope stability analysis code for ios.
The stratified rock of jurassic strata is widely distributed in three gorges reservoir region. The limit equilibrium method of analysis for static slopes is still the most widely used tool to. Further evolutions of the book and software have prompted their separation into two separate products. The analysis is carried out on two slope angles of 45 and 60, which are reinforced with nails at three different. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth. Although limit equilibrium methods are very useful. That is to say that the strength parameters are not simultaneously reduced. Different from limit equilibrium method, the advantage of numerical analysis method is. The role of analysis in the evaluation of slope stability. Slope stability analysis in lusi river, kedungrejo using. Pdf slope stability analysis limit equilibrium or the finite element. Jun 25, 2014 slope stability analysis by the limit equilibrium method.
Jul 29, 2018 details name limit equilibrium methods of slope stability analysis fundamentals pages 31 format pdf size 5 mb download method direct download download. A limit equilibrium slope stability analysis code for. Slope stability analysis limit equilibrium or the finite element method. Provide little insight into slope failure mechanisms do not consider stress state evolution or progressive failure. Slope stability analysis using limit equilibrium method in. Limit equilibrium methods, summary 2less efficient, may not converge the assumption of fully mobilized internal friction could lead to incorrect nonconservative results, if not justified e.
The limit equilibrium method lem is widely used by researchers and engineers conducting slope stability analysis. Slope stability analysis by the limit equilibrium method asce. A stability analysis of slopes based on a trans lational mechanism of failure is presented. Application note slope stability analysis worked example. Physical methods, theoretical analysis, and case studies.
Fundamentals of slope design 4 methods of slope analysis limit equilibrium methods for the analysis of slope stability have been available for decades and have now been developed to very effective design tools that permit incorporation of the most complex geological and groundwater conditions. Pdf slope stability analysis using limit equilibrium. 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. The col lapse mechanism is assumed to be in the form of rigid blocks analogous to slices in traditional slice methods. Modified limiting equilibrium method for stability analysis. Both use a plasticity criterion and the concept of safety factors for quantifying the security level. 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. The limit equilibrium method contains several limitations and inconsistencies, yet is considered the most common approach.
Huang presents fundamental principles and methods for using the limit equilibrium method in analyzing slope stability for the safe design of earth slopes. Fundamentals of slope design keynote address at slope. This book fundamentals and methods presents basic principles for the safe design design subject category. However, mohrcoulomb criterion is restricted to the description of rock mass. Finite element methods against limit equilibrium approaches. There are several fundamental causes and forms of strain softening. The failure plane for this case is parallel to the surface of the slope and the limit equilibrium method can be applied readily. Conventional methods of slope stability analysis can be divided into three groups. Pdf limit analysis versus limit equilibrium for slope. A general procedure for slope stability limit equilibrium analyses b alternative definition of factor of safety c types of limit equilibrium analyses d comments on analyses for factors of safety e examples ii general procedure for slope stability analyses focus here is on the effect of various conditions that promote slope. Methods of stability analysis cover simple formulas for determining the factor of. Evaluation of a threedimensional method of slope stability analysis. Limit equilibrium formulations based on the method of slices are also being applied more and more to the stability analysis of structures such as tieback walls, nail or fabric reinforced slopes, and even the sliding stability of structures subjected to high horizontal. The limit equilibrium method is generally utilized in the stability analysis of rock slope with single failure plane.
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