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 evaluations by limit equilibrium and finite. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. Assessment of 3d slope stability analysis methods based on. Written by worldleading geotechnical engineers who share almost 100 years of combined experience, slope stability and stabilization, second edition assembles the background information, theory, analytical methods, design and construction approaches, and practical examples necessary to carry out a complete slope stability project. Mergili 17 combined grass gis and the 3d hovland model to implement a 3d slope stability model which can accommodate both shallow and deepseated slope failures. The idea of discretizing a potential sliding mass into slices was introduced early in the 20th century. A vertical crack was accommodated in the classical 3d rotational failure mechanism by introducing a velocity discontinuity surface. Jun 06, 2018 hence, assessing corner stability requires 3d analysis. Download latest geotechnical books civil engineering community. On the contrary, in figure 22, the safety factors obtained for each scenario from a slope stability analysis with the linear phib model are shown, which consider water flow in the tailings structure.
In rock slope stability analysis conventional methods can be divided into three groups. By combining this method with the 3d upper bound approaches, it is possible to bracket the accurate solution of a 3d slope stability analysis problem into a small range. The difference between 2d and 3d slope stability analyses by robert pyke ph. They are certainly major factors in cut slope stability and in. The 3d effects side shear are accounted for only in special cases, and then in a simplified manner. Highorder finite element method fem formulation also referred to as spectral element method sem formulation is currently implemented in this paper for 3dimensional 3d elastoplastic problems in stability assessment of large scale slopes vegetated and barren slopes in different instability conditions such as seismic and saturation.
A practical 3d slope stability analysis method and the related computer programs are therefore urgently required. Svslope soilvision geotechnical software geotechnical. A simplified method for 3d slope stability analysis. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. In general, these methods can be classified into two categories. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. Jun 15, 2019 details title 3d slope stability analysis with gts nx duration 75 mins language english format mp4 size 286 mb download method direct download.
The kinematic approach of limit analysis is explored in threedimensional 3d stability analysis of slopes. Chapter 5 threedimensional slope stability analysis 186225 5. This method is literally a twodimensional 2d limit equilibrium approach. Very sofisticated model of computation of linear and nonlinear analysis based on the behavior of the ductile. Comprehensive 2d slip surface searching and porewater pressure conditions and innovative 3d spatial analysis allow modeling at new levels. The short answer to the question what is the difference between 2d and 3d analyses of slope stability by the method of slices is that it can be significant and varies in surprising ways. But in real practices, 3d slope results are more reasonable. Users can perform classic limit equilibrium slope analysis of soil or rock slopes by the method of slices or newer stressbased methods.
Scoops3d evaluates slope stability throughout a digital landscape represented by a digital elevation model dem. An assessment of threedimensional slope stability analysis methods in terms of safety factors using several idealized sliding masses composed of plane sliding surfaces was made. Threedimensional slope stability analysis of convex turning. The studied software includes 3dpcstabl thomaz 1986. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. The 3d effects are for instance taken as a function of the side area to width ratio of the slide volume. Slope stability analysis using limit equilibrium method in.
Introduction slope stability types of failure analysis using flac3d development of flac model programme to calculate fos fos using extruder pane development of flac model programme to calculate. Slope stability geotechnical engineering classical. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. Threedimensional slope stability software commercially available 3d slope stability software was studied to investigate the ability of the software to calculate an accurate 3d factor of safety. Slope stability analysis remains an active and important area of study for geotechnical engineers. The keyblock method, which is the most famous of them, is used for the stability analysis of fractured rock masses. In the analysis of slope stability, the primary task is to calculate the safety factor of the slope 15. Details title 3d slope stability analysis with gts nx duration 75 mins language english format mp4 size 286 mb download method direct download. The authors dealt with a difficult project in northern peru involving a threedimensional 3d slope stability analysis of a mine waste dump.
Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Flac3d us minneapolis itasca consulting group, inc. This paper presents a simplified threedimensional 3d slope stability analysis method based on the limit equilibrium theory. Taylor 1937 conceived the idea of analyzing the stability of a large number of slopes through a wide range of slope angles and. Svslope represents the new standard in 2d3d slope stability analysis. The vast majority of slope stability analysis is performed in two dimensions. Slope w can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Advance your digital workflows with the ability to design 3d geometry, couple processes, and analyze both 2d and 3d scenarios in one application. Tagasoft geotechnical software slope stability analysis.
It starts from establishing a compatible velocity field and obtains the factor of. In the strict framework of limit analysis, an analytical approach is derived to obtain the upper bounds on slope stability and the corresponding type of the critical failure mechanism. For a regional scale analysis, slope stability analysis menthds will be not suitable 143, 168. 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. Svslope svoffice 5ge slope stability analysis software. Slope stability analysis using flac 3d linkedin slideshare. Abstract slope stability analysis is generally done with limit equilibrium methods lem along critical cross sections in two dimensions. Due to the remarkable increase in computational power and falling costs in recent years, meaningful 3d analysis can now be performed on a conventional. Compared with the available results from the finiteelement limit analysis method, the 3d rotational failure mechanisms give the best estimate on the upper bound. Analyzing the stability of earth structures is the oldest type of numerical analysis in geotechnical engineering. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Study of unsaturated soils by coupled numerical analyses of. This study used a variationally derived 3d mechanism to analyze the stability of convex turning corners. Limit analysis and stability charts for 3d slope failures radoslaw l.
Slope stability analysis by the limit equilibrium method. Advanced numerical method for the analysis of slope stability in static and dynamic conditions. New methods and insight, second edition, edition 2 ebook written by y. Soilvision suite enables you to reliably identify and analyze slope stability, flow, and environmental processes in hundreds of locations with one click with features like multiplane analysis mpa. Build3d is a revolutionary, timesaving tool for constructing 3d analysisready geometries. By sayantan chatterjee511214007 gopal karmakar511214015 department of mining engineering,iiest shibpur 2. A gisbased 3d slope stability analysis method based on. Build3d is a revolutionary, timesaving tool for constructing 3d analysis ready geometries. The current study 14 16 extended the 2d hovland model, bishop model and janbu model to 3d models.
The main objectives of slope stability analysis are finding endangered areas, investigation of potential failure mechanisms, determination of the slope sensitivity to different triggering mechanisms, designing of optimal slopes with regard to safety, reliability and economics, designing possible remedial measures, e. New methods and insight, second edition, edition 2. Slope stability analysis is generally done with limit equilibrium methods lem along critical cross sections in two dimensions. However, the geometry of real slopes is more complex. Download latest geotechnical engineering related books for free. Stability and runout analysis of earthquakeinduced. One of the early feature requests received by soilvision systems ltd. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. Pdf a simplified method for 3d slope stability analysis. Stability analysis of 3d cracked slope reinforced with. Results of 3d stability analysis are presented in a convenient form of stability charts considering the effects of porewater pressure and seismicity. Most of the slope stability analysis computer programs are based on the limit equilibrium concept for a two or threedimensional model. Slope stability analysis introduction slope stability methods vary in their theoretical background and approach and hence the analysis results vary depending on the used theory.
Probabilistic slope stability analysis by finite elements. A 3d slope stability analysis method assuming parallel. For example, a natural slope often has curvature, and irregular surfaces appear in openpit and roadside design. Ym cheng has an interest in research work in slope stability. A major revision of the comprehensive textreference.
A threedimensional 3d slope stability analysis method, based on its twodimensional approaches proposed by donald and chen can. The program uses a threedimensional 3d method of columns limitequilibrium analysis to assess the stability of many potential landslides typically millions within a userdefined size range. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. A gisbased 3d slope stability analysis method based on the. The sections to be analyzed with slope are automatically created in a dynamic way by moving on the 3d model. Because of the normally conservational results of 2d analysis, a threedimensional 3d analysis seems to be necessary. The assumption involved in this method is of a parallel intercolumn force inclination, similar to spencers method in the twodimensional 2d area. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods.
Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools. Download for offline reading, highlight, bookmark or take notes while you read slope stability analysis and stabilization. The difference between 2d and 3d slope stability analyses. Lanethe majority of slope stability analyses performed in practice still use traditional limit. Slope stability and stabilization, second edition is filled with current and comprehensive information, making it one of the best resources available on the subjectand an essential reference for todays and tomorrows professionals in geology, geotechnical engineering, soil science, and landscape architecture. A threedimensional slope stability analysis method using the. In this case, the 3d model extrusion and 3d realistic model considering sitespecific topography did not present significant differences. The kbm method is just based on finding key blocks, and if no such blocks are found to be unstable, it is concluded that the whole of the rock mass is stable. Slope stability 2020 will provide a forum for open pit mining and civil engineering practitioners, consultants, researchers and suppliers worldwide to exchange views on best practice and stateoftheart slope technologies. 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. Download latest geotechnical books civil engineering.
Threedimensional safety factors were calculated and compared for different study cases considered in this study on the basis of the exact solution methods, the hovland method, and the 3d simplified janbu method. A major revision of the comprehensive textreference written by worldleading geotechnical engineers who share almost 100 years of combined experience, slope stability and stabilization, second edition assembles the background information, theory, analytical methods, design and construction approaches, and practical examples necessary to carry out a complete slope stability. In 1916, petterson 1955 presented the stability analysis of the stigberg quay in gothenberg. Jul 23, 2014 the analysis of slope stability is an important aspect of research in disaster reduction engineering. In this paper, the 2d keygroup method is developed into three dimensions so that a more literal analysis of a fractured rock mass can be performed. A threedimensional slope stability analysis method using. May 22, 2014 slope stability analysis and stabilization. Slope stability evaluations by limit equilibrium and. The current 3d slope stability analysis is based on a simple homogeneous slope. A 3d slope stability analysis method assuming parallel lines. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology.
Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Lafuerza, analysis of slope failures in submarine canyon heads. Introduction page 1 1 introduction analyzing the stability of earth structures is the oldest type of numerical analysis in geotechnical engineering. Its powerful, featurebased design allows for quick construction of 3d geotechnical models with complex topography or geology, and sweeping tunnels or rivers. Taylors stability number if the slope angle, height of embankment h, the effective unit weight of material, angle of internal friction, and unit cohesion c are known, the factor of safety may be determined. Probabilistic slope stability analysis by finite elements d. Stability of slopes reinforced with truncated piles. Stability analysis of 3d cracked slope reinforced with piles. In this study, the kinematical approach of limit analysis was applied to evaluate the threedimensional 3d stability of soil slopes with preexisting cracks and the reinforcement effects of piles. A research paper entitled 3d slope stability analysis. Jun 03, 2003 by combining this method with the 3d upper bound approaches, it is possible to bracket the accurate solution of a 3d slope stability analysis problem into a small range. Except a single slope analysis, where the landslides are likely to occur and what kind of seismic conditions will cause it failure are two important topics in seismic hazard assessment, i.
Slope stability verification manual deep excavation llc page 11 e. Because of the simplicity and the speed of execution, methods used in static stability analyses have yet remained relevant. In addition, simplified assumptions in 2d slope stability methods have led to factors of safety that differ from the more rigorous 3d slope stability analysis methods. When added to a seep3d license, build3d offers a suite of intuitive sketch tools and powerful. A threedimensional 3d method of analysis of the stability of slopes was developed based on the sliding mechanism observed in the 1988 failure of the kettleman hills landfill slope kettleman city, california and the associated model studies. Stability charts for 3d failures of homogeneous slopes. Limit analysis and stability charts for 3d slope failures. There are a large number of publications that deal with 3d slope stability analysis. This category includes geotechnical, soil mechanics, rock engineering and geology books. Because the analysis of slope stability is statically indeterminate, the factor of safety cannot be obtained directly from the static.
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