Slopes can be analysed in either direction, and a seismic coefficient is provided for pseudostatic analysis. Earthquakeinduced displacement rapidly decreases with increasing kykmax. Article pdf available in canadian geotechnical journal 554 march 2018 with. Pseudostatic analysis peak horizontal ground acceleration pga. Selection of seismic coefficients for use in pseudostatic.
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 analysis, including the creation and saving of screen plots, 6. Downloading the slope64 program the source code for slope64 is written in fortran 2003, but users are provided with the executable file slope64. Two example analyses were comparatively performed to verify the reliability and rationality of the pseudostatic method.
Pdf framework to assess the pseudostatic approach for the. Created in 2017, slide3 is a tool that allows geotechnical engineers to calculate the factor of safety of complex 3d slope stability geometries that 2d models cannot fully simulate. Whats new in slide2 faster sampling method, response surface, added for. Slide2 includes builtin finite element groundwater seepage analysis, probabilistic analysis, multiscenario modeling, and support design. Seismic coefficients for pseudostatic slope analysis. Selection of seismic coefficients for use in pseudostatic slope. Slope stability analysis slope w is the leading slope stability software for soil and rock slopes. The software that is used in this study is geo5 software, nowadays this software can be introduced as one of the best slope stability analysis softwares. 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. If the necessary actions for protection are not considered, it could lead to problems and events such as landslides, settlements and even destruction of roads. Pseudostatic analysis is one of the simplest approaches used in earthquake.
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. Stagedthepseudostaticbaseanalysis a staged pseudo static analysis involves the completion of two stability analyses for every single slip. 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. Macslope slope stability analysis for the mac os desktop. The pseudo static ps approach is still the most common procedure employed for standard, seismic slope stability evaluation. Pseudostatic and pseudodynamic stability analysis of. The effects of different parameters on slopes stability are shown by performing several analyses.
Slope analysis methods slope offers the following analysis methods. Slope stability evaluations by limit equilibrium and finite. Pseudo static analysis the pseudo static method yields the limit state equilibrium expressed in terms of factor of safety of slopes during seismic loading. Slope stability analysis shortterm, longterm and pseudostatic static settlement analysis immediate and consolidation seismic timehistory analysis. Geostase is a 2d limit equilibrium slope stability analysis software program developed by dr. Slopew can effectively analyze both simple and complex problems for a variety of failure modes, porewater pressure conditions, soil properties, loading conditions, and reinforcement options. Analyses of seismic slope stability problems using limit equilibrium methods in which the inertia forces due to earthquake shaking are represented by a constant. Easy to use, reliable 2d and 3d geotechnical software designed for civil engineering and mining. On the use of soil drained and undrained parameters. Pseudo static acceleration and model size slope stability. The first stage is completed without applying the seismic forces so that the effective stresses can be obtained at the base of each slice. A chartbased seismic stability analysis method for rock. The name geostase is an acronym for general equilibrium options for stability analysis of slopes and embankments.
Gslope carries out limit equilibrium slope stability analysis of existing natural slopes, unreinforced manmade slopes, or slopes with soil reinforcement. It allows either method to be applied to circular, composite, and noncircular surfaces. Two options are available for calculating the undrained strengths prior to the application of the seismic forces. Forcebased pseudostatic methods versus displacem ent based methods for slope stability analysis 253 the permanent displacement d induced by an acceleration time history can be expressed as a function of the ratio kykmax. Improvement of pseudostatic method for slope stability analysis. For geosynthetic reinforcement, gslope uses soilreinforcement interaction coefficients in combination with stress conditions at the slip surface to allow for bonding at the ends of the reinforcement. You can determine fos, deformations, slip surfaces, plastic strains and can work with different soil models and strength reduction technique too. A staged pseudostatic analysis involves the completion of two stability analyses for every single slip surface i. Per the discussions above, it appears that drained parameters e, \nu, \phi must be always used for analysis of coarsegrained materials i. In the foreign practice beside of pseudo static approach 1619, numerical dynamic calculations are used for evaluation of stability of natural slopes, embankments, dams and open pit edges at earthquakes by using different software packages abacus, plaxis, ansys, slopew, flack, udec, 3dec and newmarks deformational method 2027. Per the discussions above, it appears that drained parameters e, u, \phi must be always used for analysis of coarsegrained materials i. Pdf development of spectral pseudostatic method for dynamic.
The program uses bishops modified method and janbus simplified method. Stability charts for pseudostatic slope stability analysis. Reliability analysis of slope stability using monte carlo. Slope stability is an intuitive program for the analyses of all types of slopes and retaining walls. The evaluation of seismic slope stability and ensuring serviceability of slope after earthquake is very important.
Incorporation of the spectral pseudostatic procedure into. Development of spectral pseudostatic method for dynamic clayey slope stability analysis. Among various softwars used for slope stability analysis, the finite element based plaxis or finite difference based flac software is the best as compared to geoslopethen reason for this is. The influence of earthquakes on openpit slope stability. Slope stability best slope stability analysis software. The pseudostatic ps approach is still the most common procedure employed for standard, seismic slope stability evaluation. Seismic slope stability analysis geotechsimulation. So a pseudostatic model would actually be a dynamic model that mimics a static system. Slope w is the leading software product for analyzing the stability of earth and rock slopes. 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.
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. Model complex geometries, pore pressure conditions, tension cracks, surcharge loads, and seismic loading. More information plaxis 3d suite, which includes the 3d plaxflow and dynamics module, is a powerful and user friendly finite element package intended for threedimensional analysis of deformation and stability in geotechnical engineering and rock mechanics. Slope w, slide are commercially available to perform the required pseudostatic limit equilibrium analysis. But, pseudostatic analyses are approximate anyway and. The term landslide refers to a situation of instability affecting natural slopes and involving large volumes of soil. On the limitations of limit equilibrium analyses of slope stability.
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. Simplified design methods seismic slope stability analysis. Slopew, slide are commercially available to perform the required pseudostatic limit equilibrium. With this comprehensive range of features, slopew can be used to analyze almost any slope stability problem you will encounter in your geotechnical, civil, and mining. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. Slope w can effectively analyze both simple and complex problems for a variety of. Improvement of pseudostatic method for slope stability. 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. Robert pyke selection of seismic coefficients for use in pseudostatic slope stability analysis, 2011. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Robert pyke selection of seismic coefficients for use in pseudo static slope stability analysis, 2011. In earthquakeprone areas, the analysis is typically run for static conditions and pseudostatic conditions, where the seismic forces from an earthquake are assumed to add static loads to the analysis.
Slopew can effectively analyze both simple and complex problems for a variety of slip surface shapes, porewater pressure conditions, soil properties, and loading conditions. Swedish circle fellenius bishops methods janbus methods for noncircular slip surfaces all these methods of analysis use the method of slices to determine the factors of safety for slope stability. What is the best software to analyse the slope stability. Slide3 3d limit equilibrium analysis for slopes by rocscience. Roctopple makes it easy to visualize the slope failure in both 2d and 3d.
The term landslide refers to a situation of instability affecting natural slopes and involving large. Slope w can effectively analyze both simple and complex problems for a variety of failure modes, porewater pressure conditions, soil properties, loading conditions, and reinforcement options. Roctopple is an interactive software tool for performing toppling analysis and support design of rock slopes. Detailed pieziometric data at multiple locations and depths within and. Slope w can accommodate pseudo static analysis, limit state. Slopew is the leading slope stability cad software product for computing the factor of safety of earth and rock slopes. The analysis procedure is straight forward, however, determination of a seismic coefficient that can appropriately represent the characteristics of design earthquakes is not easy. Slopew is the leading software product for analyzing the stability of earth and rock slopes. The tailings earthen dam is analyzed for different upstream conditions of reservoir like filled up with compacted and noncompacted. Evaluation of the pseudostatic analyses of earth dams using fe. Though the pseudostatic analysis is simple and straightforward, the. In this paper the seismic slope stability analyses are performed for a typical. Stability analysis of gabion wall with tieback in seismic. The two conventional approaches to evaluate the stability of landfill structural systems consist of the pseudostatic method of analysis and the newmark slidingblock analysis.
Stagedthepseudostaticbaseanalysis a staged pseudostatic analysis involves the completion of two stability analyses for every single slip. For geosynthetic reinforcement, gslope uses soilreinforcement interaction coefficients in combination with stress conditions at the slip surface to allow for bonding at. Slope stability analysis by shear strength reduction method. Slopew is the leading slope stability software for soil and rock slopes.
Shouldnt the appropriate term be a pseudodynamic model. On the limitations of limit equilibrium analyses of slope. In addition, the analyses were performed for pore pressure distributions by seepage analyses and pseudo. Slope stability evaluations by limit equilibrium and. Design and analyze planar rock slopes with rocplane, a quick and easy tool to help you build planar models and visualize them in 2d and 3d. Rational pseudostatic stability analysis of embankments.
Pseudo static limit equilibrium analysis melo and sharma, 2004. Used for all types of slope stability problems including open pit mines, landfills, and any slope with complex geological structure and variable surface topography. This paper focuses on the use of geostudio, a finite element software for problems associated with geotechnical engineering, to solve seismic slope stability. 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. First, stability charts for calculating the factors of safety fos with a slope angle of. Plaxis 2d and 3d is best suited slope stability software if you wish working with finite element. Built as a fully 3d application slopes discretized as vertical columns. Slope stability analysis is performed to assess the safe design of a humanmade or natural slopes e. 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. Seismic response and stability analysis of landfills. A comparative study of pseudostatic slope stability. Multistage pseudostatic analysis geoslope international. The term slope means a portion of the natural slope whose original profile has been modified by artificial interventions relevant with respect to stability. 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.
Macslope brings fully featured slope stability analysis to the mac os desktop. Slope w is the leading slope stability cad software product for computing the factor of safety of earth and rock slopes. In the pseudo static approach, an equivalent seismic coefficient k is used within a conventional limit equilibrium slope stability calculation. In this paper, two drawbacks of the traditional pseudostatic method vertical slice method in the slope stability evaluation have been studied. When using numerical modeling software such as plaxis 2d to model slope stability or a tall retaining wall with seismic loads, a quick method is to use the pseudo static acceleration as opposed to several time histories and full dynamic analysis. The analysis is performed at both static and pseudo static modes. Join researchgate to find the people and research you need to help. The pseudostatic method yields the limit state equilibrium expressed in terms of factor of safety of slopes during seismic loading. Nov 20, 2017 the two conventional approaches to evaluate the stability of landfill structural systems consist of the pseudo static method of analysis and the newmark slidingblock analysis.
Stresses computed by a finite element stress analysis may be used in addition to the limit equilibrium computations for the most complete slope stability analysis available. The seismic slope stability can be ascertained by evaluating factor of safety using pseudostatic or pseudodynamic approaches and force based equilibrium method. To me pseudo means not actually, but having the appearance of, i. A staged pseudo static analysis can be completed to give consideration to this scenario. The seismic stability of earth structures has been analyzed by pseudostatic. 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 and seepage analysis results in slide2. The results of this study showed that the designed gabion wall could be stable in dense silty gravel soil gm in 8. The next step in the ongoing development of the spectral pseudostatic producer is to implement it into one of. 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. Simplified pseudostatic analysis of earthquake induced landslides. Should the user wish to carry out pseudostatic analysis or analyse a noncircular slip surface, guidance is given in the slope user manual.
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. 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. Pseudostatic and pseudodynamic stability analysis of tailings. A staged pseudostatic analysis can be completed to give consideration to this scenario. The next step in the ongoing development of the spectral pseudo static producer is to implement it into one of the available limit equilibrium slope stability software.
Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Second, only peak ground acceleration pga is considered, and the effects of shaking frequency and. Ge, principal consultant with gregory geotechnical gregeo. Reliability analysis of slope stability has attracted considerable research attention in the past few decades 610. Slopew can accommodate pseudostatic analysis, limit state. This pseudostatic force represents the destabilizing effects of the earthquakeshaking. Slide3 3d limit equilibrium analysis for slopes by. Finally, the analyses performed by this method are compared with the ones obtained by finite difference method fdm. From quick 2d analysis to complex 3d modeling, we offer the most extensive suite of tools for the analysis of soil and.
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