In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. 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. Application note slope stability analysis worked example 4. 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. This method is most primitive in the area of optimization. Attention has to be paid to geology, surface drainage, groundwater, and the.
The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. An overview on methods for slope stability analysis. The collapse mechanism is assumed to be in the form of rigid blocks analogous to slices in traditional. All examples are analysed not only in the original, but also in the reversed form, so that the deepxcav can be better veriffied. The slope stability analysis in geotechnical engineering is complicated its mechanism and the geological history of the slope.
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. Click download or read online button to get rock slope stability book now. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. 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. Four slope stability examples are presented and compared to previous fem work and limit equilibrium methods griffiths, 1999 and slide 2. 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. The failure of a mass of soil located beneath a slope is called as slide. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. 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.
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 slope stability analysis in geotechnical engineering. Importance of water next to gravity, water is the most important factor in slope stability. Intro to slope stability analysis r ced engineering. Application of the finite element method to slope stability. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Boutrup and love11 1980 presented a strategy that included random generation of slip surfaces and repeated comparisons of calculated factors of safety.
Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. Pdf slope stability analysis methods danial salajegheh. The infinite slope failure mode is an example of an internal stability problem. The groundwater analysis is run first, followed by the slope stability analysis. Slope stability analysis spreadsheet laobing kaisuo. The paper compares six methods of slices commonly used for slope stability analysis. Bakers approach 1980 employed dynamic programming, which, as. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. Chapter 4 slope stability universiti teknologi malaysia. Free download slope stability analysis spreadsheet, method of slices slope stability analysis, slope stability analysis software free download, slope stability analysis examples, ordinary method of slices spreadsheet, slope stability analysis methods pdf, factor of safety calculation for slope stability, swedish method of slices example, slope analysis pdf, incoming search terms.
Application note slope stability analysis worked example. Evaluation of minimum factor of safety in slope stability. In this example, three slope conditions are analyzed. Slope stability verification manual deep excavation llc page 4. The number of equations of equilibrium available depends on the number of slices n and the number of equilibrium conditions that are used. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Examples of common slopes include roads for commercial use, dams, excavated slopes, and soft rock trails in reservoirs, forests, and parks. This site is like a library, use search box in the widget to get ebook that you want. Finally, several case studies of slope stability analysis are summarized. How does the slope angle play a role in slope stability. Slope stability evaluations by limit equilibrium and. The effect of water on cut and fill slope stability is briefly discussed below. Results method factor of safety bishop simplified 1.
The classical way to analysis the slope stability is accessed using two methods. Slope instability may occur suddenly, as the slope is being excavated, or after the. The soil properties are presented in table 1 and the model of the problem is shown in figure 1. 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. Slope stability for a cohesive and frictional soil 11 1 slope stability for a cohesive and frictional soil 1.
The following table and screen captures summarize the analysis results. The factor of safety with respect to strength f as expressed in equation 11. The slope stability can be analyse nowadays by using a computer program. What are the factors that influence slope stability. 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 by the limit equilibrium method. Pdf numerical methods in analysis of slope stability. Slope stability analysis of peat landslides has been undertaken in relatively few cases. Soil slope stability analysis 339 isfied for each and every slice, it is also satisfied for the entire mass. A stability analysis of slopes based on a translational mechanism of failure is presented. Important aspects in slope stability analysis in this section, three major aspects that influence slope stability analysis are discussed. The normal force equation is of the same form for all methods with the exception of the ordinary method. Phase2, in the analysis of slope stability problems. 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. 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 failure is the movement of mass on slope falls, slides, flows landslide. 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. Pdf importance of slope stability problem is the reason why so many alternate methods have been developed for evaluating the safety of a slope. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. The quantitative determination of the stability of slopes is necessary in a number of engineering activities, such as. 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. How do friction and cohesion work together to stabilize slopes. The stability analysis is completed with partial factors applied to. Detailed pieziometric data at multiple locations and depths within and. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. 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. 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.
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