The slope stability analysis in geotechnical engineering is complicated its mechanism and the geological history of the slope. Application note slope stability analysis worked example 4. Slope stability analysis spreadsheet laobing kaisuo. Examples of common slopes include roads for commercial use, dams, excavated slopes, and soft rock trails in reservoirs, forests, and parks. The normal force equation is of the same form for all methods with the exception of the ordinary method. A stability analysis of slopes based on a translational mechanism of failure is presented. Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. The groundwater analysis is run first, followed by the slope stability analysis. Attention has to be paid to geology, surface drainage, groundwater, and the. These examples are intended to serve both as a guide for input of data to the computer program, utexas, and to illustrate a variety of typical slope stability problems.
This method is most primitive in the area of optimization. Importance of water next to gravity, water is the most important factor in slope stability. Evaluation of minimum factor of safety in slope stability. The slope stability can be analyse nowadays by using a computer program. A slope is defined as a surface of which one end or side is. The following table and screen captures summarize the analysis results. Application note slope stability analysis worked example. Slope stability verification manual deep excavation llc page 4. Four slope stability examples are presented and compared to previous fem work and limit equilibrium methods griffiths, 1999 and slide 2. Bakers approach 1980 employed dynamic programming, which, as. The collapse mechanism is assumed to be in the form of rigid blocks analogous to slices in traditional. Slope stability evaluations by limit equilibrium and. Pdf numerical methods in analysis of slope stability. Slopew can be used to complete a stability analysis with the objective being to check an ultimate limit state in accordance with various limit state design approaches such as eurocode 7, norwegian standard ns 3480, and british standard 8006.
In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. In this example, three slope conditions are analyzed. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. Slope stability analysis of peat landslides has been undertaken in relatively few cases. Detailed pieziometric data at multiple locations and depths within and.
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. How do friction and cohesion work together to stabilize slopes. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. The infinite slope failure mode is an example of an internal stability problem. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Slope failure is the movement of mass on slope falls, slides, flows landslide.
Rules of thumb and easy method of estimating slope stability geology and soils information needed from site or soils database check appropriate loading conditions seeps, rapid drawdown, fluctuating water levels, flows select values to input for. 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 quantitative determination of the stability of slopes is necessary in a number of engineering activities, such as. Boutrup and love11 1980 presented a strategy that included random generation of slip surfaces and repeated comparisons of calculated factors of safety. Hounsa hebei university of technology, tianjin, china abstract the stability of earthworks cuttings, embankments, dikes and natural slopes is a problem that is of concern to geotechnicians, both practitioners and researchers. Rock slope stability download ebook pdf, epub, tuebl, mobi. Intro to slope stability analysis r ced engineering.
The classical way to analysis the slope stability is accessed using two methods. It also highlights some of the differences in approach to that adopted by the limit equilibrium method of slices. All examples are analysed not only in the original, but also in the reversed form, so that the deepxcav can be better veriffied. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Finally, several case studies of slope stability analysis are summarized. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. Results method factor of safety bishop simplified 1. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments.
Slope instability may occur suddenly, as the slope is being excavated, or after the. Considering the importance of slope stability to their work, its beneficial for civil engineers to understand how to. Slope stability analysis by the limit equilibrium method. The soil properties are presented in table 1 and the model of the problem is shown in figure 1. Chapter 4 slope stability universiti teknologi malaysia. Slope stability is the process of calculating and assessing how much stress a particular slope can manage before failing. Soil slope stability analysis 339 isfied for each and every slice, it is also satisfied for the entire mass. This site is like a library, use search box in the widget to get ebook that you want. Phase2, in the analysis of slope stability problems. They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope failures. Where this has been done, the peat failure is usually treated as a translational planar slide and a simple infinite slope analysis is used to back calculate strength parameters of the slope at the time of failure hendrick, 1990. Click download or read online button to get rock slope stability book now. Application of the finite element method to slope stability.
It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis detailed assessment of the groundwater regime within and beneath the slope is also critical. The simplest problem of slope stability that we can analyze, and that we should understand in detail because it is so basic, is that of the stability of the socalled infinite slope. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. 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. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. The infinite slope solution is also an exact solution, the methods of slices which we examine later are approximate solutions. The stability analysis is completed with partial factors applied to. The factor of safety with respect to strength f as expressed in equation 11. Pdf importance of slope stability problem is the reason why so many alternate methods have been developed for evaluating the safety of a slope. An overview on methods for slope stability analysis. This is defined as the ratio between the maximum height of a slope to the actual height of a slope and may be expressed as follows. What are the factors that influence slope stability.
The factor of safety equations are written in the same form, recognizing whether moment and or force equilibrium is explicitly satisfied. Tagasoft geotechnical software slope stability analysis. The term landslide refers to a situation of instability affecting natural slopes and involving large. The failure of a mass of soil located beneath a slope is called as slide. The number of equations of equilibrium available depends on the number of slices n and the number of equilibrium conditions that are used. The paper compares six methods of slices commonly used for slope stability analysis. Important aspects in slope stability analysis in this section, three major aspects that influence slope stability analysis are discussed.
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. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. 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. Pdf slope stability analysis methods danial salajegheh. 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 slope stability analysis in geotechnical engineering. The effect of water on cut and fill slope stability is briefly discussed below. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Slope stability for a cohesive and frictional soil 11 1 slope stability for a cohesive and frictional soil 1. How does the slope angle play a role in slope stability.
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