In addition, some findings from earlier projects have been refined or disputed in later studies. The resulting factor of safety is the ratio of the soil s actual shear strength to the reduced shear strength at failure. Geo slope international ltd, calgary, alberta, canada. Strength reduction stability geoslope international. The post processing function can display the development condition of the plastic zone, which is the criterion for instability of the slope. Jan 25, 2005 authoritative, stateoftheart guidance to soil strength and slope stability analysis. Schedule for ence 647 slope stability and seepage i. Feb 22, 2005 buy soil strength and slope stability by duncan, j. Using clear, concise language and practical examples, the book explains the practical aspects of geotechnical engineering as applied to slopes and embankments.
Stability analysis of steep bedding rock slope with. Assessing the influence of root reinforcement on slope. Soil strength and slope stability, duncan wright 2005. Rock slope engineering civil engineering i am menglim.
Soil strength and slope stability 14 hours of instruction notes for all lectures in a 3ring binder. The effect of spacing of rock bolts on the stability of. Slope stability averaging slope inclinations, unit weights, and shear strengths soils with cf 0 soils with cjj 0 infinite slope charts soils with cjj 0 and strength increasing with depth examples references index 248 253 254 256 260 261. The increase in soil shear strength due to root reinforcement is considered as an increase in apparent soil. The undrained shear strength during rapid drawdown is controlled by the.
University of maryland ence 647 slope stability and seepage. We are also grateful for the opportunity to work with nilmar janbu, who during his sabbatical at berkeley in 1969 taught us many valuable lessons regarding analysis of slope stability and the shear strength of soils. The principles of limit equilibrium analysis, and appropriate use of computer programs are emphasized. It is clear however that earthquakes do influence slope stability and can lead to slope failures on a catastrophic scale see, for example, seed. Wright of shinoak software, who is wellrecognized as one of the leading experts in solving problems in soil strength and slope stability duncan and wright, 2005. Nov 24, 20 authoritative, stateoftheart guidance to soil strength and slope stability analysis. Soil strength and slope stability pdf visually informative with more than 250 illustrations, soil strength and slope stability is.
Soil strength and slope stability in searchworks catalog. The strength reduction method based on abaqus simulate antislide pile slope stability analysis that has a true reflection of the elastic. The detailed discussion of the effects of earthquakes on slope stability is outside the scope of this section. An advantage of this particular twolayer approach is that the emerging hillslope water dynamics also typically divide the profile into saturated and unsaturated zones.
Two continuumfem slope stability analysis techniques gravity increase method increase g until the slope becomes unstable and equilibrium solutions no longer exist. Authoritative, stateoftheart guidance to soil strength and slopestability analysis. Soil strength and slope stability fills the gap in industry literature by providing practical information on the subject without including extraneous theory that may distract from the application. Slope stability analysis using finite element techniques. Through clear, concise language and practical examples, soil strength and slope stability describes stateoftheart methods for the evaluation and analysis of soil strength, as well as design and stabilization of slopes in soil.
Using slopew, stability during rapid drawdown can be analyzed in two. Slope stability, triggering events, mass movement hazards. Using shear strength reduction method for 2d and 3d slope. These projects span approximately 15 years, and each developed relationships and theories for soil strength relationships in different areas of the state. There are several studies that have been carried to study the stability of slopes in residual soil areas in different parts of the world and the following paragraphs is a brief on some of these. Extensive case studies throughout help illustrate the principles and techniques described, including a new examination of hurricane katrina failures, plus examples of soil and slope engineering from around the world. Effect of soil hydraulic properties model on slope. Stability analysis of steep rock bedding slope with weak structure planes using strength reduction method was simulated in this paper. Gravity is the force that acts everywhere on the earths surface, pulling everything in a direction toward the center of the earth.
Methods for analysis of slope stability are described and are illustrated. Geotechnical stability analysis by strength reduction. In this study, a numerical model of seepage finite element analysis using bc, vg, and ln model were used and compared in order to analyze the soil moisture distribution, water movement phenomenon, and slope stability characteristic in unsaturated soil slope based on the strength reduction method srm. Review of shear strength principles 2 lectures stress, strain and strength drained and undrained strength parameters laboratory and field tests for shear strength ii. Soil strength and slope stability 14 hours of instruction notes for all lectures in a 3ring binder a flash drive with reference materials. A number of txdotsponsored studies and research projects have been conducted over the years regarding shear strength and slope stability issues of embankments. Slope stability is a major concern for geotechnical and mining engineers worldwide, and consequently, a great deal of effort at rocscience is dedicated to slope stability analysis software. Utexas4 is a computer software application for computing the stability of earth and earthrock slopes and embankments. Soil strength and slope stability, 2nd edition civil. University of maryland ence 647 slope stability and. Evaluation of soil shear strengths for slope and retaining wall stability analyses with emphasis on high plasticity clays.
Soil strength and slope stability, second edition presents the latest thinking and techniques in the assessment of natural and manmade slopes, and the factors that cause them to survive or crumble. Stability analysis of a reinforced soil slope based on the. Of the software which is currently available from rocscience, half of all programs are either specifically dedicated to slope stability analysis ie. This paper aims to investigate the effect of root reinforcement on slope stability using finite element methods. Groundwater and seepage 4 lectures flow through porous media hydraulic conductivity flow nets. Symbol parameter dimensions f factor of safety against sliding along sheet joint calculated h height of the overall slope or of each bench 60 m or 20 m respectively. H height of the overall slope or of each bench 60 m or 20 m respectively. The definitive guide to the critical issue of slope stability and safety soil strength and slope stability, second edition presents the latest thinking and techniques in the assessment of natural and manmade slopes, and the factors that cause them to survive or crumble. Utexas analyze the stability of complex slopes software. Sep 27, 2016 slope stability is a critical element of geotechnical engineering, involved in virtually every civil engineering project, especially highway development.
Analysis with working conditions of natural circumstance, after excavation, and the slope reinforced by. In stability analysis calculation of safety factor sf, as the. Sep 22, 2014 soil strength and slope stability by j. Through clear, concise language and practical examples, soil strength and slope stability describes state of the art methods for evaluating soil strength, and for analysis, design and stabilization of slopes in soil. The principles of limit equilibrium analysis, and appropriate use. Soil strength and slope stability, 2nd edition wiley. Oct 21, 2014 soil strength and slope stability is the essential text for the critical assessment of natural and manmade slopes. Authoritative, stateoftheart guidance to soil strength and slope stability analysis through clear, concise language and practical examples, soil strength and slope stability describes state of the art methods for evaluating soil strength, and for analysis, design and stabilization of slopes in soil. This shearstrength reduction technique can also be applied to geotechnical stability problems such as cantilever walls, braced excavations and retaining walls. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Shipping may be from multiple locations in the us or from the uk, depending on stock availability. Using shear strength reduction method for 2d and 3d slope stability analysis thamer yacoub, ph.
Stability charts for uniform slopes university of michigan. They are certainly major factors in cut slope stability and in. Soil strength and slope stability is the essential text for the critical assessment of natural and manmade slopes. Examples of slope failure 5 causes of slope failure 14 summary 17 chapter 3 soil mechanics principles 19 drained and undrained conditions 19 total and effective stresses 21 drained and undrained shear strengths 22 basic requirements for slope stability analyses 26 chapter 4 stability conditions for analyses 31 endofconstruction stability 31. Soil strength and slope stability civil engineering. The resulting factor of safety is the ratio of the soils actual shear strength to the reduced shear strength at failure. On a flat surface the force of gravity acts downward. Soil strength and slope stability is the definitive guide to the practice, essential for every civil engineering project. Earthquake shaking may change the applicable shear strength properties. It is well recognised that plant roots can improve the shear strength of soils by their high tensile strength and closely spaced root matrix system.
Soil strength and slope stability 1st edition by duncan, j. Michael duncan is university distinguished professor emeritus of civil and environmental engineering, and codirector of the center for geotechnical practice and research cgpr at virginia tech in. Using clear, concise language and practical examples, the book explains the practical aspects of geotechnical. Criteria are presented for strength tests, analysis conditions, and. Geotechnical stability analysis by strength reduction slope. For the three cases in which the friction angle is 0, since the critical slip surface is a deepseated surface with a large horizontal extent, the models are larger than the one as shown in fig. Rock bolts are used to improve the stability and load bearing characteristics of a.
In limit equilibrium techniques, slope stability is analyzed by first. Authoritative, stateoftheart guidance to soil strength and slope stability analysis. The definitive guide to the critical issue of slope stabilityand safety soil strength and slope stability, second editionpresents the latest thinking and techniques in the assessment ofnat. Estimation of in situ strength from backanalysis of pit. Everyday low prices and free delivery on eligible orders. The extent of the root zone is defined by thedepth of root zone, h r. Rapid drawdown analysis using strength reduction cfms. Soil strength and slope stability civil engineering community. Our university colleagues jim mitchell,royolson,clarencechan,kenlee,peterdunlop. The principles of limit equilibrium analysis, and appropriate use of computer programs are.
Buy soil strength and slope stability by duncan, j. Impact of waterlevel variations on slope stability. In the ssr finite element technique elastoplastic strength is assumed for slope materials. Geoslope international ltd, calgary, alberta, canada. Using clear, concise language and practical examples, the book explains the practical aspects of geotechnical engineering as.
Written by two recognized experts in the field, soil strength and slope stability features. Wright is best book to understand slope stability problems all answers 6 5th may, 2015. Parametric studies are conducted and the results are used to develop a set of stability charts that can be used to assess the contribution of root reinforcement on slope stability. Apr 21, 2015 the twolayer concept, composed of distinct unsaturated and saturated soil zones, is frequently used in the infinite slope stability model to represent different unit soil weights. One problem in developing stability charts for calculating the fs is that many parameters are involved, such as the slope height h, the slope angle. This shear strength reduction technique can also be applied to geotechnical stability problems such as cantilever walls, braced excavations and retaining walls. Apply large generalpurpose finite element analysis software abaqus as a platform, the criterion of iteration nonconvergence conventionally used for assessing the instability state of slopes,and an example is given to the following conclusions. The twolayer concept, composed of distinct unsaturated and saturated soil zones, is frequently used in the infinite slope stability model to represent different unit soil weights. Michael duncan, 9781118651650, available at book depository with free delivery worldwide.
Slope stability analysis consists of determining and comparing the shear stress developed along the potential rupture surface with the shear strength of the soil. Soil moisture and slope stability linkedin slideshare. Sgi glimit gtrue strength reduction method decrease the strength parameters of the slope until slope becomes unstable and equilibrium solutions no longer. Attention has to be paid to surface drainage, groundwater, and the shear strength of soils in assessing slope stability. Slope stability, triggering events, mass movement hazards factors that influence slope stability gravity the main force responsible for mass movement is gravity. Case histories of landslides, embankment failures, excavation slope failures principles that govern the shear strength of soils, including shear strength of municipal solid waste methods for estimating and evaluating shear strengths based on back. Authoritative, stateoftheart guidance to soil strength and slopestability analysis through clear, concise language and practical examples, soil strength and slope stability describes state of the art methods for evaluating soil strength, and for analysis, design and stabilization of slopes in soil.