Erosion changes the geometry of the slopes, resulting in a slope failure or a landslide. Fig 1 4 illustration of infiltration and run off on the natural slope. Aided design the university of iowa iowa city, iowa usa th iowa asce geotech. Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and test. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or spencer methods. Slopes in mountainous regions require cohesion 8 undrained short term slope failure in clay. Application of the finite element method to slope stability. Slope stability is the resistance of inclined surface to failure by sliding or collapsing. Nptel advanced foundation engineering1 module 7 lecture 24 to 28 retaining walls topics 24. This was applied in the model by selecting all the boundary lines between the mudstone and weathered mudstone unshow the water table, to facilitate. Chapter 10 slope stability analysis nysdot geotechnical page 106 january 21, 2014 design manual 10.
In this method, the potential failure surface is assumed. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. 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. Analysis of finite slopes possible failure surfaces. Application note slope stability analysis worked example. Planar failures i infinite slopes ii finite slopes ii. An introduction to slope stability and protection j. Ppt slope stability analysis powerpoint presentation. Mod05 lec40 lecture 1 on stability of slopes youtube. 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.
Probabilistic slope stability analysis by finite elements d. In this video i have talked about the friction circle method to check the stability of the soil on finite slope. Fig 1 5 laboratory simulation of rainfall induced slope failure using the moisture content measurements. Slope angle or simply slope is the angle of inclination of a slope to the horizontal. The study showed the values of factor of safety for upstream slope increase for a low rate of reservoir drawdown 3. How does the slope angle play a role in slope stability. Attention has to be paid to geology, surface drainage, groundwater, and the shear strength of soils in assessing slope stability. Bvs viswanadham, department of civil engineering, iit.
Taylor 1937 conceived the idea of analyzing the stability of a large number of slopes through a wide range of slope angles and angles of internal friction, and then representing the. For an additional 9 years he was a principal advisor to. Mod05 lec41 lecture 2 on stability of slopes youtube. Chapter 4 static stability analysis is an existing chapter within design standards no. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. Important aspects in slope stability analysis in this section, three major aspects that influence slope stability analysis are discussed. Nptel syllabus geotechnical earthquake engineering. Lowering of minimum factor of safety for reservoir operational conditions. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. 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 analyses is performed numerically using the limit equilibrium based software slopew, a product of geostudio.
Application note slope stability analysis worked example 4. Lecture notes, lectures 1012 stability of slopes studocu. Cdotdtdr200210 sponsored by the colorado department of transportation in cooperation with the u. Nptel provides elearning through online web and video courses various streams.
In geotechnical engineering, the topic stability of slopes deals with. Global stability with relict slip surface in this scenario, the presence of the relict slip surface was assumed. Climate longterm climate changes can have a significant impact on slope stability. Slope stability analysis using finite element techniques colby c. Excavation is a common method for increasing stability of a. Slope stability analysis of an earth dam diyala journal of engineering sciences, vol. Nptel syllabus geotechnical earthquake engineering video course course outline this course on geotechnical earthquake engineering introduces the fundamental concepts of earthquake engineering related to geotechnical problems, principles of earthquake, wave propagation, dynamic soil properties, liquefaction and seismic design of.
Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Type of failure toe failure, base failure and slope failure. Evaluation of slope stabilization methods us 40 berthoud pass by michael banovich william skip outcalt report no. An overall decrease in precipitation results in a lowering of the water table, as well as a decrease. This broad definition encompasses many and varied applications.
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. Slope stability analysis 1 slope stability analysis for landfills and embankments geotechnical design cgn 4801 by kamal tawfiq, ph. Since, ec7 does not have a special provision for the problem of a footing on the crest of slope, the question whether it is a bearing capacity or a slope stability problem remains. 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. The slope angle is usually referred to as a ratio, for example, 2.
Slope stability analysis using finite element techniques. Unloading is a type of slope stabilization technique to reduce the driving forces within a slide mass. The second is the influence of calculating factor of safety to slope stability and the third aspect is the definition of the slope failure. Friction circle method stability of finite slopes soil. Dec 31, 2015 advanced geotechnical engineering by dr. 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. In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools. Slope stability analysis by finite elements article pdf available in geotechnique 517. Joint initiative of iits and iisc funded by mhrd page 6 of 16. B v s viswanadham, department of civil engineering, iit bombay. 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 engineering design of slopes of manmade slopes in advance a earth dams and embankments, b excavated slopes, c deepseated failure of foundations and retaining walls. How do friction and cohesion work together to stabilize slopes. This program is used to perform slope stability analysis embankments, earth cuts, anchored retaining structures, mse walls, etc. 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. Nptel civil engineering unsaturated soil mechanics. The slip surface is considered as circular bishop, felleniuspetterson, janbu, morgensternprice or spencer methods or polygonal sarma, janbu, morgensternprice or. Probabilistic slope stability analysis by finite elements. 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. Taylor 1937 conceived the idea of analyzing the stability of a large number of slopes through a wide range of slope angles and. Some of these, such as longterm or cyclic climate changes, are not discernible without instrumentation andor longterm recordkeeping. The slope stability analysis is crucial in engineering practice to ensure the stability of structures and prevent loss of human life and money. Ppt slope stability analysis powerpoint presentation free. Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes e. Soils and foundations testing experience theory lesson 06 chapter 6 slope stability.
Part v1 introduction, pore pressure parameters and undrained shear. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. 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. Department of transportation federal highway administration july 2002 colorado department of transportation research branch. 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. 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. They are certainly major factors in cut slope stability and in. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. Viswanadham,department of civil engineering,iit bombay. 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.