Allowable degree of risk of slipping which is determined based on the existing structures and new constructed buildings around the. The factor of safety with respect to strength f as expressed in equation. Bvs viswanadham, department of civil engineering, iit. Nptel syllabus advanced structural analysis video course course outline this course mainly deals with matrix analysis of structures. 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. Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and. 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. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of.
This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability. 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. The rock slopes are composed of highly jointed rock mass and the joint spacing and orientation are varying at different locations. An overall decrease in precipitation results in a lowering of the water table, as well as a decrease.
Probabilistic slope stability analysis by finite elements d. Slope stability analysis 1 slope stability analysis for landfills and embankments geotechnical design cgn 4801 by kamal tawfiq, ph. Chapter 10 slope stability analysis nysdot geotechnical page 106 january 21, 2014 design manual 10. B v s viswanadham, department of civil engineering, iit bombay. 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. Joint initiative of iits and iisc funded by mhrd page 6 of 16. Evaluation of minimum factor of safety in slope stability. Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes e. Cdotdtdr200210 sponsored by the colorado department of transportation in cooperation with the u. For an additional 9 years he was a principal advisor to. Excavation is a common method for increasing stability of a. Nptel syllabus geotechnical earthquake engineering video course course outline.
Infinite and finite earth slopes types of failures factor of safety of slopes stability analysis by method of slices, bishops simplified method. 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. Fig 1 4 illustration of infiltration and run off on the natural slope. Viswanadham,department of civil engineering,iit bombay. Limit equilibrium is the most widely used method for stability analysis. Fig 1 5 laboratory simulation of rainfall induced slope failure using the moisture content measurements. The slope stability calculated for bishop, janbu, spencer and gle is summarized in the graph below. Slope angle or simply slope is the angle of inclination of a slope to the horizontal. Slope stabilization methods generally reduce driving. Abutment design example michigan technological university. Analysis of finite slopes possible failure surfaces. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Planar failures i infinite slopes ii finite slopes ii. Stability analysis of slope is one of the most sought after problem in civil engineering.
Stability analysis of a slope and finding critical slip surface. Mod05 lec41 lecture 2 on stability of slopes youtube. How do friction and cohesion work together to stabilize slopes. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. It is concerned with 1 the characteristics and critical aspects of various types of slope stability problems, 2 geologic studies and site investigation procedures, 3 methods of designing slopes, including field observations and experience, slope stability charts, and. Ppt slope stability analysis powerpoint presentation. 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 limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. Slope stability can be analyzed using one or more of the following. The slope stability analysis is crucial in engineering practice to ensure the stability of structures and prevent loss of human life and money.
They are certainly major factors in cut slope stability and in. Slope stability analysis by finite elements article pdf available in geotechnique 517. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Stability of slopes in open excavation in different soil condition along with the factors that control slope stability in open excavation are discussed. The term landslide refers to a situation of instability affecting natural slopes and involving large. Time during which the excavation is required to be open.
In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Aided design the university of iowa iowa city, iowa usa th iowa asce geotech. Slope stability causes of instability, analysis methods. This broad definition encompasses many and varied applications. Slope stability verification manual deep excavation llc page 11 e. Application note slope stability analysis worked example 4. Part v1 introduction, pore pressure parameters and undrained shear. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Some of these, such as longterm or cyclic climate changes, are not discernible without instrumentation andor longterm recordkeeping. Detailed pieziometric data at multiple locations and depths within and.
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. Taylor 1937 conceived the idea of analyzing the stability of a large number of slopes through a wide range of slope angles and. Nptel syllabus geosynthetics and reinforced soil structures video course course outline this course introduces the students to the different types of geosynthetics, their manufacturing technique, testing methods and their applications in different types of civil engineering projects. Evaluation of slope stabilization methods us 40 berthoud pass by michael banovich william skip outcalt report no. Friction circle method stability of finite slopes soil. A slope is an inclined boundary surface between air and the body of an earthwork such as highways, cut or fill, railway cut or fill, earth dams, levees and river training work. Civil engineering advanced geotechnical engineering nptel. The stability of natural slopes like hilly terrain, river beds etc. Seismic stability analysis of a himalayan rock slope. Slope stability analysis using finite element techniques colby c. Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and test. Attention has to be paid to geology, surface drainage, groundwater, and the shear strength of soils in assessing slope stability. Nptel civil engineering unsaturated soil mechanics. How does the slope angle play a role in slope stability.
Type of failure toe failure, base failure and slope failure. Slope stability analysis by the limit equilibrium method. Stability of slopes for excavations in different soil types. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. Slope stability lesson 06 topic 1 stability analysis of slopes. Mod05 lec40 lecture 1 on stability of slopes youtube. Climate longterm climate changes can have a significant impact on slope stability. 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. Nptel syllabus geotechnical earthquake engineering. Chapter iii gravity dams federal energy regulatory. Probabilistic slope stability analysis by finite elements. Reinforced soil slopes and embankments for the purposes of this document, a reinforced slope is defined as a compacted fill embankment that incorporates the use of horizontally placed geosynthetic reinforcement to enhance the stability of the soil structure. Box 366, beijing, peoples republic of chitla received september 1, 1987 accepted april 11, 1988 this paper explores the feasibility of using optimization methods to search for.
Chapter 10 slope stability analysis nysdot geotechnical page 1011 january 21, 2014 design manual 10. Lecture notes, lectures 1012 stability of slopes studocu. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Attention has to be paid to geology, surface drainage, groundwater, and the. Stability analysis of rock slopes using the finite element.
Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. Slope stability is the resistance of inclined surface to failure by sliding or collapsing. Paul guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years experience in the design of buildings and related infrastructure. 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. Evaluation of minimum factor of safety in slope stability analysis zuyu chen and changming shao institute of water consetvanc and hydroelectric power research, p. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Application note slope stability analysis worked example. 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. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. Seismic slope stability analysis, behaviour of reinforced soil under seismic conditions, seismic design of retaining structures, seismic analysis of tailings dam, seismic displacement. The slope angle is usually referred to as a ratio, for example, 2. The geological strength index, gsi, relates the failure criterion to geological observations in the field.
Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes. Department of transportation federal highway administration july 2002 colorado department of transportation research branch. Chapter 4 static stability analysis is an existing chapter within design standards no. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. Slope stability analysis using finite element techniques. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools. Seismic slope stability tim mccrink seismic hazards mapping program california geological survey 100th anniversary earthquake conference commemorating the 1906 san francisco earthquake april 18 22, 2006. An introduction to slope stability and protection j. Slope gradient slope azimuth strong motion record hazard potential matrix dip slope map slope gradient geologic material strength map landslide hazard potential map, zone mapzone map generalized work flow shear strength data shear strength groups a y vs. Dec 31, 2015 advanced geotechnical engineering by dr. Instead of assuming a circular failure surface, the slope was analyzed for noncircular failure by optimizing surfaces in a path search.
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