A seismic slope stability probabilistic model based on. Framework to assess pseudostatic approach for seismic. To me pseudo means not actually, but having the appearance of, i. Data tables for establishing the slope geometry, and assigning soil properties and boundary loads, 4. The evaluation of seismic slope stability and ensuring serviceability of slope after earthquake is very important. The next step in the ongoing development of the spectral pseudostatic producer is to implement it into one of. Stability charts for pseudostatic slope stability analysis. Table 2 static and pseudostatic slope stability analysis description of analysis figure no. Reliability analysis of slope stability has attracted considerable research attention in the past few decades 610.
Reliability of slope stability is frequently measured by reliability index, and slope failure probability, p f, which is defined as the probability that the minimum. Macslope is an app designed to calculate and search for the critical factor of safety of earth slopes, using common methods of limit equilibrium slope stability analysis. At present, there are roughly four methods for seismic stability analysis of slopes. So a pseudostatic model would actually be a dynamic model that mimics a static system. This pseudostatic force represents the destabilizing effects of the earthquakeshaking. Stagedthepseudostaticbaseanalysis a staged pseudostatic analysis involves the completion of two stability analyses for every single slip.
This approach uses a single, monotonicallyapplied horizontal andor vertical acceleration to represent earthquake loading. Comparative study of soil slopes using static and pseudo. Model complex geometries, pore pressure conditions, tension cracks, surcharge loads, and seismic loading. The analysis is performed at both static and pseudostatic modes. A summary of the slope stability analyses of the cross sections analyzed is presented below. Mobislope slope stability analysis for engineers on the go. In fact, the seismic load is equivalent to invariably horizontal and vertical forces, and the problem of seismic stability of slopes is simpli. Unlike the previous studies, the formulation presented in this paper is able to analyse any type of the sliding surface. Pdf this study compiles the results of seismic stability analysis of an infinite slope from three methodologies, i. Two example analyses were comparatively performed to verify the reliability and rationality of the pseudostatic method. C department of the army, office of the chief of engineers, 1982. In these methods, the pseudostatic method is the simplest at the earliest applications 4. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. Slope stability analysis by shear strength reduction method.
Rational pseudostatic stability analysis of embankments. Origin of the seismic coefficient approach terzaghi 1950 severe 0. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. However, the use of the pseudostatic method in these soils is also problematic as clayey slopes are always failed in pseudostatic stability analyses i. Gb 5033020 recommends seismic stability analysis for permanent slopes in earthquake zones where the basic intensity is 7 or greater. Pdf performancebased slope stability analysis and the pseudo. Keywords slope stability, slope, displacement, performance, seismic coefficients 1. A computer program was developed to validate manual calculations and facilitate calculation work. Incorporation of the spectral pseudostatic procedure into.
Detailed pieziometric data at multiple locations and depths within and. Selection of seismic coefficients for use in pseudostatic. Michalowski, stability assessment of slopes with cracks using limit analysis, canadian geotechnical journal, 20, 50, 10, 1011crossref. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. Terzaghi 1950 first applied a pseudostatic approach to analyze seismic slope stability. Variation of factor of safety with respect to static forces and. Robert pyke selection of seismic coefficients for use in pseudostatic slope stability analysis, 2011. In addition, the analyses were performed for pore pressure distributions by seepage analyses and pseudo. Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. Many researchers have developed new calculation methods to analyze seismic slope stability problems, but the conventional pseudostatic method is still widely. Further details about the limit equilibrium theory, search procedures and slice development are. The current state of art for limit equilibrium analysis of slope stability problems lacks a satisfactory procedure for stability evaluation under general, rapid undrained loading conditions.
In this paper, two drawbacks of the traditional pseudostatic method vertical slice method in the slope stability evaluation have been studied. 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. Pseudostatic slope stability analysis the pseudostatic slope stability analysis is based on the evaluation of the limit equilibrium in which the inertial effects of the earthquake are represented as horizontal and vertical forces. I am grateful for the financial support provided by the offshore. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. Limitations of pseudo static methods in stability analysis. Slope stability evaluations by limit equilibrium and. B4 pseudostatic slope stability analysis to determine yield acceleration b5 permanent displacement calculations attachment c results of static and seismic slope stability analyses crosssection across phase iv c1 results of static slope stability analysis c2 results of seismic slope stability analysis.
Slope stability analysis, including the creation and saving of screen plots, 6. Mobislope brings fully featured slope stability analysis to the ipad. Improvement of pseudostatic method for slope stability. The effects of different parameters on slopes stability are shown by performing several analyses. Some procedures are available for the analysis of rapid drawdown, but these suffer from several shortcomings and, furthermore, are not applicable to. Reliability analysis of slope stability using monte carlo. Join researchgate to find the people and research you need to help. Finally, the analyses performed by this method are compared with the ones obtained by finite difference method fdm. Rather, our intent is to illustrate the principal steps taken in the development of commonly used, rational screen procedures, and the conditions for which these procedures are intended to be applicable. Pdf framework to assess the pseudostatic approach for the. 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. 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 philosophiae doctor in civil engineering. 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.
Pdf numerical methods in analysis of slope stability. Multistage pseudostatic analysis geoslope international. The term landslide refers to a situation of instability affecting natural slopes and involving large. Second, only peak ground acceleration pga is considered, and the effects of shaking frequency and. From analysis of the stability of the downstream slope before the earthquake, the s. A comparative study of pseudostatic slope stability analysis using different design codes xinguang yang a, endi zhai b, yuan wang c, zhongbo hu d a central research institute of building and construction co. Macslope slope stability analysis for the mac os desktop. Macslope brings fully featured slope stability analysis to the mac os desktop. Although the vertical acceleration can be included in a pseudostatic analysis, it is rarely used in practice, as explained below. In this case, since it is kh,max kh,eq kh,c permanent displacements will occur figure 3a and evaluation of slope stability requires a comparison of. Comparative study of soil slopes using static and pseudostatic approaches written by parbin sultana, suman hazari published on 20140526 download full article with reference data and citations. A comparative study of pseudostatic slope stability.
These are the socalled pseudostatic forces, which are assumed to be. A comparative study of pseudostatic slope stability analysis using. Two options are available for calculating the undrained strengths prior to the application of the seismic forces. If no important buildings are present in the sliding areas, a pseudostatic method combined with the limit equilibrium method lem or finite element method fem can be used to assess the seismic slope stability. Seismic coefficients for pseudostatic slope analysis. Finite element fe pseudostatic analysis can provide a good compromise between. Appendix b shows plots of the yield acceleration values that have been obtained from pseudostatic analysis assuming ho mogeneous soil profile with c and. Assessment of seismic slope stability using gis modeling. Slope stability analysis for undrained loading conditions. 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 analysis under seismic load by vector sum. 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. The seismic slope stability can be ascertained by evaluating factor of safety using pseudostatic or pseudodynamic approaches and force based equilibrium method.
Fig 2 force diagram of soil above failure surface in pseudo static slope stability analysis. A staged pseudostatic analysis can be completed to give consideration to this scenario. Shouldnt the appropriate term be a pseudodynamic model. Slope stability analyses for materials with a nonlinear. Mobislope is an app designed to calculate and search for the critical factor of safety of earth slopes, using common methods of limit equilibrium slope stability analysis. 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. A screen analysis procedure for seismic slope stability. Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. 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. Rock slope engineering civil engineering i am menglim. The pseudostatic ps approach is still the most common procedure employed for standard, seismic slope stability evaluation.
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