Ppt slope stability analysis powerpoint presentation. Lisa and xstabl have become standard analysis tools for resource planning level and sitespecific slope stability assessments, respectively, on national forests in the westem united states. Mod05 lec40 lecture 1 on stability of slopes youtube. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Probabilistic slope stability analysis by finite elements. The col lapse mechanism is assumed to be in the form of rigid blocks analogous to slices in traditional slice methods. Application note slope stability analysis worked example 4. Taylor 1937 conceived the idea of analyzing the stability of a large number of slopes through a wide range of slope angles and. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Slope stability causes of instability, analysis methods. The seismic slope stability analysis of the right abutment of a railway bridge proposed at about 350 m above the ground level, crossing a river and connecting two huge hillocks in the himalayas, india, is presented in this paper. Bvs viswanadham, department of civil engineering, iit. Stability analysis of rock slopes using the finite element. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods.
Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and test. Lanethe majority of slope stability analyses performed in practice still use traditional limit. Geomechanics research center colorado school of mines. Stability analysis of slope is one of the most sought after problem in civil engineering. Stability analysis results of the reinforced slope. 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. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. Limit equilibrium analysis of slope stability is comprised of two coupled problems. Civil engineering advanced geotechnical engineering nptel. It is a practical method for the evaluation of the shortterm stability of saturated clay slopes.
The stability of natural slopes like hilly terrain, river beds etc. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Slope stability analysis by the limit equilibrium method books. The rock slopes are composed of highly jointed rock mass and the joint spacing and orientation are varying at different locations.
Ppt slope stability analysis powerpoint presentation free. Evaluation of minimum factor of safety in slope stability. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Nptel syllabus geosynthetics and reinforced soil structures video course. Calculation of deformations at slope stress levels, and 5. Traditional slope stability analysis is carried out using limit equilibrium methods, an approach that is easy to get familiar with and relatively simple enough to make calculations. Analysis of finite slopes possible failure surfaces. Part v1 introduction, pore pressure parameters and undrained shear. They are certainly major factors in cut slope stability and in.
Undrained analysis stability charts taylors method. Probabilistic slope stability analysis by finite elements d. Seismic stability analysis of a himalayan rock slope. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. 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 factor of safety is an indication of whether a slope is safe or not, minimum values and other standards are normally stipulated by regional regulations. At present, there are roughly four methods for seismic stability analysis of slopes. Slope stabilization methods generally reduce driving forces. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. In this study slopew 2007has been applied separately and together with seepw, sigmaw, based on finite elements mesh were coupled with slope stability analysis to determine the factor of safety, this is the key issue on slope monitoring gradually drawdown. Stability calculations with slopew and plaxis2d to find out factorof s safety fos compare the result with novapoint gs stability analysis determination of critical failure surface of the slope sensitivity analysis cohesion and friction angle 3. At sikfors the followings point will be considered. Factor of safety of slope stability from deformation energy. Planar failures i infinite slopes ii finite slopes ii.
Slope stability analysis by the limit equilibrium method. How do friction and cohesion work together to stabilize slopes. Structural analysis by aslam kassimali solution manual. Slope stability analysis under seismic load by vector sum. The factor of safety, f, in fe slope stability analysis duncan, 1996 is defined as shear strength of material soil or rock f shear strength required for equilibrium t t 1.
Viswanadham,department of civil engineering,iit bombay. Slope stability analysis 1 slope stability analysis for landfills and embankments geotechnical design cgn 4801 by kamal tawfiq, ph. Slope stability analysis by finite elements article pdf available in geotechnique 517. Using a unified approach to address a medley of engineering and construction problems, slope stability analysis and stabilization. Nptel syllabus advanced structural analysis video course course outline this course mainly deals with matrix analysis of structures. Rock slope stability analysis hardcover january 1, 1992 by gian paolo giani author see all formats and editions hide other formats and editions. Attention has to be paid to geology, surface drainage, groundwater, and the. 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.
Mod05 lec40 lecture 1 on stability of slopes nptelhrd. This can be established by using text book published stability numbers for simple bank slopes. Evaluation of minimum factor of safety in slope stability analysis zuyu chen and changming shao institute of water consetvanc and hydroelectric power research, p. Recall modes of slope failureexplain effects of water on slope stability discuss slope stability circular and block. The quantitative determination of the stability of slopes is necessary in a number of engineering activities, such as. 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. New methods and insight, second edition provides helpful practical advice and design resources for the practicing engineer. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of.
Chapter 10 slope stability analysis nysdot geotechnical page 1011 january 21, 2014 design manual 10. Slope stability analysis consists of determining and comparing the shear stress developed along the potential rupture surface with the shear strength of the soil. Soil slope stability analysis using the friction circle. Cs the required minimum cohesion for stability, psf g the moist soil density, pcf.
Slope stability analysis using finite element techniques colby c. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and. Box 366, beijing, peoples republic of chitla received september 1, 1987 accepted april 11, 1988. Current practices in slope stability analysis and computer programs application to slope stability analysis for existing embankment dams guidance papers for static slope stability analysis minor corrections and editorial changes. The term landslide refers to a situation of instability affecting natural slopes and involving large. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools.
Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Nd static conditions dynamic conditions infinite slope model. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Includes recommendations for analysis, design practice, design charts, tables, and more. How does the slope angle play a role in slope stability. Nptel syllabus geotechnical earthquake engineering. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. Attention has to be paid to geology, surface drainage, groundwater, and the shear strength of soils in assessing slope stability. Stability analysis lisa, stability analysis for road access sara, the level i1 program, and xstabl the level 111 program. Forces involved for the calculation of stability of slopes. Friction circle method stability of finite slopes soil.
Slope instability may occur suddenly, as the slope is being excavated, or after the. The paper is titled, slope stability analysis using generalized method of slices by b. Detailed pieziometric data at multiple locations and depths within and. Excavation slope instability may result from failure to control seepage forces in and at the toe of the slope, too steep slopes for the shear strength of the material being excavated, and insufficient shear strength of subgrade soils. Mar 21, 2016 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. Slope stability analysis using finite element techniques. Origin of the seismic coefficient approach terzaghi 1950 severe 0. Therefore, slope stability analysis under seismic load is more complex than that under static load. Design and analysis of retaining walls 3 f crib walls or coffer dams are cells or units to be filled with soil or builtup members of pieces of precast concrete or metal and are supported by anchor pieces embedded in the soil for stability. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. The most common slope stability analysis methods are based on simplifying assumptions and the design of a stable slope relies heavily on experience and careful site investigation. Learning outcomes gat the end of this session, the participant will be able to. Asce journal of geotechnical and geoenvironmental engineering, vol. This 2 pdh online course is intended for civil engineers, structural engineers, geotechnical engineers, geologists and other design and construction professionals seeking an introduction to methods and techniques for.
Stability analysis of rock slopes using the finite element method. However the minimum constructive elements provided in the program do not allow the software to perform analysis for complex cases. Slope instability may occur suddenly, as the slope is being excavated, or after the slope has been standing for some time. Intro to slope stability analysis r ced engineering. Hibbeler video solutions matrix analysis of structures by aslam kassimali matrix analysis of structures by aslam kassimali structural analysis ii energy principle structural analysis 2, structural analysis nptel, structural analysis 1, structural analysis 2, structural analysis nptel. Dec 31, 2015 mod05 lec40 lecture 1 on stability of slopes nptelhrd. Bishop slope stability using excel spreadsheet slope. 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. Twodimensional slope stability analysis by limit equilibrium and strength reduction methods. Types of geosynthetics like geotextiles, geogrids, geonets. Aided design the university of iowa iowa city, iowa usa th iowa asce geotech. In this chapter, we will examine the stability of earth slopes in two dimensional space using limit equilibrium methods. Lecture notes, lectures 1012 stability of slopes studocu. Apr 12, 2017 slope stability analysis consists of determining and comparing the shear stress developed along the potential rupture surface with the shear strength of the soil.
The stability analysis is of a homogeneous slope subjected to a horizontal acceleration factor. Application note slope stability analysis worked example. Robustness ability to perform successfully under a wide range of conditions. This method of slope stability analysis is based on the assumption that the plane of failure is in the form of a circular arc. 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. Simslope stands for simplified slope stability analysis software. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes.
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