Rock slope stability analysis hardcover january 1, 1992 by gian paolo giani author see all formats and editions hide other formats and editions. Slope w, slide are commercially available to perform the required pseudostatic limit equilibrium analysis. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. First, the sliding mass is divided into vertical slices according to this method, which is irrational to some extent in the seismic design of slope. Hazard assessment in dynamic slope stability analysis. Rational pseudostatic stability analysis of embankments. A previously stable slope may be initially affected by preparatory factors, making the slope conditionally unstable. Terzaghi 1950 first applied a pseudostatic approach to analyze seismic slope stability. Several research works have been published on the slope stability in the northern tuscany central italy and particularly in the seismic areas of garfagnana and lunigiana lucca and massacarrara districts, aimed at analysing the slope stability under static and dynamic conditions and mapping the landslide hazard.
This approach uses a single, monotonicallyapplied horizontal andor vertical acceleration to represent earthquake loading. Pdf the pseudostatic method is considered the simplest approach to evaluate the stability of earthslopes against shakes. In order to account for the dynamic forces induced by ground shaking, a novel procedure is introduced in this paper to estimate slope stability under the ultimate limit state with a combination of pseudodynamic approach and discretisation technique. Slope stability evaluations by limit equilibrium and finite. A staged pseudo static analysis can be completed to give consideration to this scenario. The paper presents a solution for the stability of slopes in purely cohesive soils exhibiting a linear variation in shear strength with depth. Slope w can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Slope stability is an extremely important consideration in the design and construction of embankments, earth dams. Fundamentals and methods presents basic principles for the safe design of constructed or natural earth slopes.
The assumed pseudo static forces acting on a potential sliding mass of weight w will be. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. New methods and insight, second edition provides helpful practical advice and design resources for the practicing engineer. This pseudostatic force represents the destabilizing effects of the earthquakeshaking. Slope stability analysis in seismic areas of the northern. A pseudostatic method is adopted to account for the inertial forces induced in the rock mass by seismic events. Seismic stability of geotechnical structures like dams, embankments, solid waste landfills, etc. Includes recommendations for analysis, design practice, design charts, tables, and more.
Since k designates the horizontal force to be used in the stability analysis, its selection is crucial. Robert pyke selection of seismic coefficients for use in pseudostatic slope stability analysis, 2011. 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 is a great improvement over the historic pseudostatic approach still. We have slide version 5 at the office but this is a pseudo static slope stability program. A staged pseudostatic analysis can be completed to give consideration to this scenario. Two example analyses were comparatively performed to verify the reliability and rationality of the pseudostatic method. Analyses of seismic slope stability problems using limit equilibrium methods in which the inertia forces due to earthquake shaking are represented by a constant horizontal force equal to the weight of the potential sliding mass multiplied by a coefficient are commonly referred to as pseudo static analyses. The focus of this geotechnical analysis and design section is to present methods and guidelines. Join researchgate to find the people and research you need to help. This book also presents limit equilibrium methods i and ii, which are the. In a pseudostatic slope stability analyss, a factor of safetyi fs is computed using a static limit equilibrium method in which a horizontal earthquakeinduced inertial force is applied to the potential sliding mass. Stability analyses of cut slopes in weathered rock in brazil and malaysia are included. Performancebased slope stability analysis and the pseudostatic.
Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. The newmarks sliding block analysis method is an engineering that calculates permanent displacements of soil slopes also embankments and dams during seismic loading. Simplified design methods seismic slope stability analysis. Seismic analysis and design of retaining walls, buried.
I thank the people on the 9th floor who always had a smile on their face. Although the vertical acceleration can be included in a pseudo static analysis, it is rarely used in practice, as explained below. In addition, the analyses were performed for pore pressure distributions by seepage analyses and pseudo. A comparative study of pseudostatic slope stability. Slope analysis summarizes the fundamental principles of slope analysis. Slope stability is the potential of soil covered slopes to withstand and undergo movement. Two options are available for calculating the undrained strengths prior to the application of the seismic forces. Although the vertical acceleration can be included in a pseudostatic analysis, it is rarely used in practice, as explained below.
Before presenting its conclusions, the book discusses special aspects of slope analysis, such as earthquake analysis, pseudostatic analysis, dynamic analysis, and anisotropy, in addition to newmarks approach. The pseudo static method of analysis, like all limit equilibrium methods, provides an index of stability the factor of safety but not information on deformations associated with slope failure. Download for offline reading, highlight, bookmark or take notes while you read slope analysis. Newmark analysis does not calculate actual displacement, but rather is an index value that can be used to provide an indication of the structures likelihood of failure during a seismic event. The slope stability analyses are performed to assess the safe and economic design of human. I am grateful for the financial support provided by the offshore technology and research center otrc during my involvement with this project. Shouldnt the appropriate term be a pseudodynamic model. The most commonly used method for analyzing seismic slope stability is the socalled pseudostatic analysis technique, which was first employed by terzaghi 16 in the analysis of slopes subjected.
Selection of seismic coefficients for use in pseudostatic. Performancebased slope stability analysis and the pseudo. The analysis procedure is straight forward, however, determination of a seismic coefficient that can appropriately represent the characteristics of design earthquakes is not easy. The limit equilibrium method is the most common approach for analyzing slope stability in both two and three dimensions. In earthquake engineering to analyze the seismic response of soil embankments and slopes simply adding a permanent body force representing the earthquake shaking to a static limitequilibrium analysis. Pseudo static limit equilibrium analysis melo and sharma, 2004. Slope stability evaluations by limit equilibrium and. The stability of a slope during or after a seismic event can be studied by means of different methods according to the approximation accepted.
It explores not only the similarities but also the differences in rock slopes and soil slopes, and it presents alternative methods of analysis, new concepts, and new approaches to analysis. It also includes stress analysis and slope stability, natural slope analysis, and a brief. One challenge in slope stability analysis is how to locate the potential sliding surface. Many researchers have developed new calculation methods to analyze seismic slope stability problems, but the conventional pseudostatic method is still widely. Recent developments for both pseudostatic stability analysis and newmark displacement analysis.
This paper first summarizes the pseudostatic slope stability analysis method based on the two design codes and subsequently examines the factors influencing the seismic coefficient k. In the pseudostatic approach, an equivalent seismic coefficient k is used within a conventional limit equilibrium slope stability calculation. Seismic slope stability international journal of computational. Improvement of pseudostatic method for slope stability. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. This book is aimed at highlighting engineering concepts and stability analysis. Slopes are more vulnerable to instability when subjected to earthquake ground shaking. The most commonly used method for analyzing seismic slope stability is the socalled pseudo static analysis technique, which was first employed by terzaghi 16 in the analysis of slopes subjected.
Pdf development of spectral pseudostatic method for dynamic. Slope stability analysis by the limit equilibrium method. A case history of seismic stability analysis of an adriatic coast flysch slope has been employed to evaluate the applicability and reliability of these methods. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Stability charts for pseudostatic slope stability analysis.
A staged pseudostatic analysis involves the completion of two stability analyses for every single slip surface i. The first stage is completed without applying the seismic forces so that the effective stresses can be obtained at the base of each slice. In fact the pseudo static approach estimates the stability of a slope under dynamic loads by the dynamic safety factor. Aug, 2016 the pseudo static method of analysis, like all limit equilibrium methods, provides an index of stability the factor of safety but not information on deformations associated with slope failure. The stability analysis of passive boltreinforced rock slopes under seismic loads is investigated within the framework of the kinematic approach of limit analysis theory. 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. A pseudo static method is adopted to account for the inertial forces induced in the rock mass by seismic events. In the present study, pseudo static limit equilibrium slope stability analysis of landfill proposed in goa is performed by considering the effects of the above parameters using conventional and rational method of selection of horizontal seismic coefficient considering the effect of vertical seismic acceleration. Second, only peak ground acceleration pga is considered, and the effects of shaking frequency and. Could anybody recommend the most user friendly seismic slope stability analysis software in the market.
A comparative study of pseudostatic slope stability analysis using. Slope stability verification manual deep excavation llc page 11 e. Stability is determined by the balance of shear stress and shear strength. Multistage pseudostatic analysis geoslope international. The analysisresults gave indications about the most appropriate seismic coefficient to be used in pseudo. So a pseudostatic model would actually be a dynamic model that mimics a static system. Geological survey, can regionally evaluate threedimensional slope stability throughout the digital elevation model dem utilizing 3d method of columns approach reid et al. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Pseudostatic stability analysis of msw landfills in goa.
Using a unified approach to address a medley of engineering and construction problems, slope stability analysis and stabilization. Framework to assess pseudostatic approach for seismic stability of. Download for offline reading, highlight, bookmark or. In earthquakeprone areas, the analysis is typically run for static conditions and pseudo static conditions, where the seismic forces from an earthquake are assumed to add static loads to the analysis. Threedimensional seismic slope stability assessment with. The pseudo static ps approach is still the most common procedure employed for standard, seismic slope stability evaluation. Rock slope engineering civil engineering i am menglim. Stagedthepseudostaticbaseanalysis a staged pseudostatic analysis involves the completion of two stability analyses for every single slip. Stability and runout analysis of earthquakeinduced. Rock slope stability analysis giani, gian paolo on. I am grateful for the financial support provided by the offshore.
Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes e. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Forces acting on a slope in pseudo static slope stability analysis. Seismic slope stability analysis geotechsimulation. The pseudostatic ps approach is still the most common procedure employed for standard, seismic slope stability evaluation. Pseudostatic analysis of clay slopes subjected to earthquakes. In earthquake engineering to analyze the seismic response of soil embankments. Reliability analysis of slope stability using monte carlo. It presents design information on structural geology, shear strength of rock and ground water, including weathered rock. In order to account for the dynamic forces induced by ground shaking, a novel procedure is introduced in this paper to estimate slope stability under the ultimate limit state with a combination of pseudo dynamic approach and discretisation technique.
Stagedthepseudostaticbaseanalysis a staged pseudo static analysis involves the completion of two stability analyses for every single slip. Rock slope engineering covers the investigation, design, excavation and remediation of manmade rock cuts and natural slopes, primarily for civil engineering applications. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Robert pyke selection of seismic coefficients for use in pseudo static slope stability analysis, 2011. Approaches commonly used to assess the seismic stability of slopes range from the relatively simple pseudostatic method to more complicated. To me pseudo means not actually, but having the appearance of, i. Missouri university of science and technology scholars mine. Improvement of pseudostatic method for slope stability analysis.
The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. Pseudostatic stability analysis of rock slopes reinforced by. This study compiles the results of seismic stability analysis of an infinite slope from three methodologies, i. Kinematic analysis of seismic slope stability with a. In fact the pseudostatic approach estimates the stability of a slope under dynamic loads by the dynamic safety factor. Detailed pieziometric data at multiple locations and depths within and.
This book sheds new light on improved methods for the study of the initiation and runout of earthquakeinduced landslides. May 15, 2014 in this paper, two drawbacks of the traditional pseudo static method vertical slice method in the slope stability evaluation have been studied. The term landslide refers to a situation of instability affecting natural slopes and involving large. The book introduces both natural and manmade slopes. Pseudostatic stability analysis of rock slopes reinforced. Note that these stability analyses should normally be conducted using the undrained strength of the soil because of the shortterm loading from the earthquake. Terzaghi 1950 first applied a pseudo static approach to analyze seismic slope stability. The assumed pseudostatic forces acting on a potential sliding mass of weight w will be. Analyses of seismic slope stability problems using limit equilibrium methods in which the inertia forces due to earthquake shaking are represented by a constant horizontal force equal to the weight of the potential sliding mass multiplied by a coefficient are commonly referred to as pseudostatic analyses. By using this approach, you can evaluate the slope stability and the potential for any flow failure, however you cannot get a rough estimate of slope deformation. In the pseudo static approach, an equivalent seismic coefficient k is used within a conventional limit equilibrium slope stability calculation.
Forces acting on a slope in pseudostatic slope stability analysis. This approach is a generalization of common limiting equilibrium le slope stability analysis in which earthquake effects are represented by an equivalent static force, the magnitude of which is a product of a seismic coefficient k and the weight of. In the present study, pseudostatic limit equilibrium slope stability analysis of landfill proposed in goa is performed by considering the effects of the above parameters using conventional and rational method of selection of horizontal seismic coefficient considering the effect of vertical seismic acceleration. In this paper, two drawbacks of the traditional pseudostatic method vertical slice method in the slope stability evaluation have been studied. A catalogue record for this book is available from the british library library of congress cataloging in publication data rock slope engineering. Determine the yield acceleration ky using a pseudostatic stability analysis for the slope that is, the seismic coeffi cient corresponding to a factor of safety equal to 1. Is the angle between ground surface and horizontal.
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