In this study, the writer used ordinary and bishop simplified method to build the excel program for slope stability analysis. Pdf slope stability analysis by nite elements semantic. Detailed pieziometric data at multiple locations and depths within and below the slope. The common methods for the analysis of a slopes stability are culmann method, ordinary method of slices and bishop method of slices. The majority of slope stability analyses performed in practice still use traditional limit equilibrium approaches involving methods of slices that have remained essentially unchanged for decades. Finite slope if the backfill slope changes to horizontal within the limits of the active wedge of failure, the slope may be analyzed in two ways. A concise algorithm is introduced to perform slope stability analysis to determine the geometry of the critical slip circle and the corresponding factor of safety without the need for iterative. The purpose of this course is to show the reader that slope stability design by friction circle theory can be easily and accurately calculated by pc computer using excel worksheets. The effects of stochastic hydraulic conductivity on the slope stability of an embankment dam are investigated using a combination of random field simulation, seepage analysis, and slope stability. A slope is defined as a surface of which one end or side is. The failure of a mass of soil located beneath a slope is called as slide. The referenced june,2000 letter also acknowledged receipt of a proposal dated june 2, 2000, prepared by scs engineers that recommended an appropriate method to determine slope stability. Slope stability analysis by finite elements geotechnique. Figure 3 illustrates the location of the two 2 slope sections that were analyzed for slope stability.
Graphical output is included to illustrate deformations and mechanisms of failure. How does the slope angle play a role in slope stability. The slope stability analysis has been prepared in accordance with the. Pdf probabilistic slope stability analysesa case study. Geotechnical soil and rock design parameters are required for slope stability analysis with strength parameters developed using methodologies presented in chapter 5 and the other referenced publications in section 7. An overview on methods for slope stability analysis.
Slope is the resistance of inclined surface to failure by sliding or collapsing. Pdf slope stability analysis by nite elements osman. 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. Nptel provides elearning through online web and video courses various streams. Analysis of finite slopes possible failure surfaces. Lecture notes advanced soil mechanics civil and environmental. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. Bishop, the use of the slip circle in the stability analysis of slopes, geotechnique, 51. The slopes were chosen based on proximity to boring locations and also areas of steep slope to yield worst case scenario conditions. Basic slope stability as written by roy whitlow 2001 is selected for developing the spreadsheet. Methods of slope stability analysis o limit equilibrium method o limit analysis method o numerical methods we will consider only the limit equilibrium method, since it is the oldest and the mostly used method in practice.
The failure of a slope may lead to loss of life and property. Slope stability analysis should consider the cases of shortterm and long. Slope stability lesson 06 topic 1 stability analysis of slopes section 6. 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. The stability analysis study of conventional retaining walls variation design in vertical slope u c sari 1, m n sholeh2, and i hermanto 1 1 civil engineering department, faculty of engineering, diponegoro university, jl. A major class of secondorder systems can be described by the.
Case studies of rainfallinduced failure of cut slopes seboong oh a. Stability analysis for nonlinear ordinary differential. Detailed assessment of the groundwater regime within and beneath the slope is also critical. Methods for enhancing stability of unstable slopes. Jan 29, 2004 petersonpuritan ou2 stability analysis december 2003 shield engineering, inc.
Slope stability analysis using limit equilibrium method in. Infinite and finite earth slopes types of failures factor of safety of slopes stability analysis by method of slices, bishops simplified method. Mar 21, 2016 analysis of infinite slope with completely submerged slope if the slope is completely submerged, and if there is no seepage as in fig. These lecture notes introduces the field of rock slope stability analysis and the purpose such analyses serve in the investigation of potential slope failure mechanisms. They are certainly major factors in cut slope stability and in. He has more than 25 years of experience with teaching and research in geosynthetics and reinforced soil structures.
The steep slope in zone 1 necessitated safety ropes. Slope stability analysis is a static or dynamic, analytical or empirical method to evaluate the stability of earth and rockfill dams, embankments, excavated slopes. This type of analysis is also utilized to determine. Phase plane analysis phase plane analysis is a graphical method for studying. Local regulations pertain to geotechnical stability and monitoring of open pits during closure. These regulations state that, if a pit is flooded, a method to prevent inadvertent access must be applied outside the area susceptible to wall collapse. Slope stability this program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Rock slope stability analysis utilization of advanced. In this method, the potential failure surface is assumed. Nptel notes for civil engineering structural analysis 1 pdf book. Slope stabilization methods generally reduce driving forces. The results of the handmade calculations are compared with the results from the geo5 slope stability program. The first to make a valid slope stability analysis possible through use of simple charts and simple equations was taylor 9.
Pdf stability of slope and seepage analysis in earth dam. Professor, department of civil engineering, iit madras. Methodology of slope stability analysis it is a method to expresses the relationship between resisting forces and driving forces driving forces forces which move earth materials downslope. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Fs c r c r required cohesion to just maintain a stable slope and f. In this paper, the stability of a 40 m high cut slope was analyzed using both deterministic and probabilistic approach. Geometry of failure surface can be characterized by the three angles. According to the subsurface investigation, sand and clay layers existed at. Probabilistic slope stability analysis by finite elements. Viswanadham,department of civil engineering,iit bombay.
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. The slope of the phase trajectory passing through a point. Soil slope stability analysis 339 isfied for each and every slice, it is also satisfied for the entire mass. Lecture notes, lectures 1012 stability of slopes studocu. Perform a global slope stability analysis to confirm if the factor of safety of the critical slip surface passing beyond the soil anchors is greater than 1. For proposed dams, an analysis of the stability and adequacy is required unless. Salunkhe and others published an overview on methods for slope stability analysis find, read and cite all the research you need on researchgate. Pdf slope stability analysis limit equilibrium or the. How do friction and cohesion work together to stabilize slopes. Slope stability in banded clays was a serious problem in the first 30 miles. Mod05 lec40 lecture 1 on stability of slopes youtube.
Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis. Slope stability analysis under unsaturated conditions. Stability analyses were performed using the computer program slope w, part of the geotechnical analysis software package geostudio 2012, developed by geo slope international, ltd. In gisbased kinematic analysis, a slope prone to planar failure has to meet the requirements associated with the strength, daylighting and orientation conditions as follows presented in figure 5a. Stability analysis results of the reinforced slope. Slope w is a twodimensional limit equilibrium stability analysis software program that permits slope stability calculation using various limit equilibrium methods.
Unfortunately, these chart solutions have been published in. As well as being completely updated throughout, three new chapters have been added on watershed dynamics, hillslope stability, and stream. Pdf an overview on methods for slope stability analysis. Geotechnical engineering study notes handwritten free. The number of equations of equilibrium available depends on the number of slices n and the number of equilibrium conditions that are used. Attachment b results of static and seismic slope stability analyses crosssection across phase iii b1 location of slope stability crosssection and test boring b2 results of static slope stability analysis b3 probabilistic seismic hazard based on usgs b4 pseudostatic slope stability analysis to determine yield acceleration. For the slope stability analysis, the safety factor is computed based on the general limit equilibrium method that encompasses various methods inside using slope w in geo studio 2012 software. With the advent of highspeed electronic computers, other generalized solutions wilh different basic assumptions have been obtained and published. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Naylor, finite elements and slope stability, in by mp method numerical methods in geomechanics, d.
Grid reinforcement with an index strength 80 knm is selected for the lowest reinforcement zone as it provides a minimum available stress av 240. In some cases, the stability andor durability of the existing embankment fill may be questionable because the fill materials are suspect or because slope instability in the form of raveling, downslope lobes, or slope failures have been observed during the site reconnaissance phase. This powerful program can solve in seconds which used to take days or weeks to calculate by hand. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. 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. Undrained analysis stability charts taylors method. Bishop slope stability using excel spreadsheet slope. Stability analysis of a slope and finding critical slip surface.
Some embankments constructed of material that is susceptible. Chapter 4 static stability analysis is an existing chapter within design standards no. Because of the climate, frost action was a major consideration throughout the length of the line. Analysis of slope the analysis of slope in this study was based on two formulas known as modified 9 method and also modified 10 method. Maximizing impacts of remote sensing surveys in slope.
Stability analysis results of the slope considering soil to be homogenised with equivalent values of c and. Slope stability analysis geo slope 2012 slice free body diagram. Paper open access slope stability analysis using modified. Lowering of minimum factor of safety for reservoir operational conditions current practices in slope stability analysis and computer programs. B v s viswanadham, department of civil engineering. Stability analysis of geotextile encased sand columns by shaymaa kadhim b. Slope stability causes of instability, analysis methods, and. Design and construction of anchored flexible facing.
Back wrapping technique for reinforced soil slopes. The graphical method involves the use of a stereonet, which is a twodimensional. Geosynthetics and reinforced soil structures nptel. The results of slope stability analyses of the permanent slopes in the near vicinity of seismic category i and ii structures indicate acceptable static longterm factors of safety with values greater than 1. S viswanadham, advanced geotechnical engineering, nptel video. Geotechnical risk management for victor mine closure m desjardins et al. Kinematic slope stability analysis traditionally has been performed using either one of two methods a graphical method or calculations using trigonometrybased equations. On the other hand, the construction of unreinforced embankments with flat slope angles dictated by stability considerations is an alternative often precluded in projects where design is controlled by space. Slope stability analyses is performed numerically using the limit equilibrium based software slope w, a product of geostudio 2012 the following reinforcement options have been studied in connection with slope stability. Advanced geotechnical engineering nptel pdf squarespace. Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes and the equilibrium conditions. Soil slope stability analysis using the friction circle. B v s viswanadham, department of civil engineering, iit bombay.
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 on oct 3, 2015, mahammedi charf published slope stability analysis report find, read and cite all the research you need on researchgate. Stability analysis results of the slope considering effect of inclusion of 4 stone columns separately. Although simple to design, concrete wall alternatives have generally led to elevated construction and material costs. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Slope stability analysis seminar at university of sydney.
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