Comparison du logiciel geotechnique geo fem, plaxis, zsoil j. Ive just read your note regarding pseudo static acceleration. Cgdams is a finite element based program written specifically for the stability analysis of concrete gravity dams. Slope stability analysis slopew is the leading slope stability software for soil and rock slopes. I tried to do that but i couldnt find applied pseudo static acceleration information in output window. Apr 17, 2014 in plaxis 2d and plaxis 3d a pseudostatic acceleration can be defined per phase.
Geo fem is geotechnical software based on the finite element method utilized friendly platform from geo4 programs. Jan 27, 2014 the numerical calculations using plaxis software involve 3 phases. The analysis is performed at both static and pseudo static modes. Jan 28, 2020 plaxis 2d dynamics is an addon module to plaxis 2d. A pseudo static approach is a strongly simplified approach of an earthquake situation. First phase is dam plastic analysis conducted for the time when the construction is over. Low frequency vibrations can normally be calculated with a pseudo static analysis, by default available in plaxis, however for more advanced seismic analysis the dynamics module is required. This paper presents a case study consisting of consolidation analysis and determination of the.
Comparison of geotechnic softwares plaxis, zsoil and geo mkp. For geosynthetic reinforcement, it uses soilreinforcement interaction coefficients in combination with stress conditions at the slip surface to. One of the major new additions is the 3d tunnel designer. Downloading the slope64 program the source code for slope64 is written in fortran 2003, but users are provided with the executable file slope64. In this method shear strength is considered to be reduced as less as failure occurs. Aug 16, 2019 slopes can be analysed in either direction, and a seismic coefficient is provided for pseudo static analysis. In modelling the dynamic response of a soil structure, the inertia of the subsoil and the. Stagedthepseudostaticbaseanalysis a staged pseudo static analysis involves the completion of two stability analyses for every single slip. Limitstate analysis method based on pseudostatic approach is among several methods that have been used to study seismic stability of gravity retaining walls mononobe, and matuo. Comparison of the pseudostatic and dynamic behaviour of. Lowfrequency vibrations can normally be calculated with a pseudo static analysis by default available in plaxis. 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 mechanisms and the general aspects developed in pseudo static analysis are explained in this article, along with simple examples. In the pseudostatic analysis, the peak ground acceleration is converted into a pseudostatic inertia force and applied as a horizontal incremental gravity load.
In this study, the upper san fernando and kitayama earth dams, which have been designed using the pseudostatic approach and damaged during the 1971 san fernando and 1995 kobe. The strength reduction approach has also been used to solve pseudostatic stability problems in a frictionalcohesive material 26. When pseudostatic analysis is not enough low frequency vibrations can normally be calculated with a pseudostatic analysis, by default available in plaxis, however for more advanced seismic analysis the dynamics module is required. Also, in order to do seismic stability analysis, could you confirm the sequence i dont have dynamic module, i only have plaxis 2d classic version. The tunnel designer guides the user through different modes to create the tunnel geometry, a tunnel path and the excavation segments. It uses plaxis, which is capable of calculating deformations rates and safety factors by gaining geometry data of a problem and soil specifications and using the finite element method fem. The effects of vibrations have to be calculated with a dynamic analysis when the frequency of the dynamic load is in the order or higher than the natural frequency of the medium. Plaxis 2d dynamics is an addon module to plaxis 2d. This approach is similar to the way gravity is introduced in the model but we can specify the magnitude and also the direction i.
Seismic displacement of gravity retaining walls sciencedirect. Seismic design and analysis of underground structures. The retaining wall with backfill material was analysed with inclusion of. Stagedthepseudostaticbaseanalysis a staged pseudostatic analysis involves the completion of two stability analyses for every single slip. Comparison of geotechnic softwares plaxis, zsoil and. Analysis of a nailed soil slope using limit equilibrium. I need to run a pseudostatic lateral analysis in which structural inertia represents the earthquake load. Low frequency vibrations can normally be calculated with a pseudostatic analysis, by default available in plaxis, however for more advanced seismic analysis the dynamics module is required. Plaxis 2d geotechnical dynamic modeling software by bentley systems incorporated.
Plaxis software update archives page 2 of 5 plaxis. Second phase includes dam plastic analyses under own body load and finally the last step consists of dynamic analysis under earthquake loading. Performancebased seismic analysis of an anchored sheet. Slopes can be analysed in either direction, and a seismic coefficient is provided for pseudostatic analysis. However, for more advanced seismic analysis, choose the plaxis 2d dynamics module. Pdf analysis of retaining wall in static and seismic. Perform dynamic analyses in a userfriendly, efficient, and accurate wa. Plaxis plaxis geotechnical finite element analysis. As the analysis is performed with the help of software tools, static analysis is a very costeffective way of discovering errors.
The experimental results confirm the predictions of stress limit analysis and concluded that the pseudostatic stability analysis performs adequately for both harmonic and seismic excitations. I have rarely use abaqus so can not tell much about that. Previous 1 2 3 5 next bentley systems is a software development company that supports the professional needs of those responsible for creating and managing the worlds. Where can i find applied pseudostatic acceleration. Low frequency vibrations can be calculated with a pseudo static analysis. Pseudostatic earthquake analysis, block slip analysis, bearing capacity analysis and probability. I would like to apply a seismic coefficient to inertia such that lateral force is a fraction of g, and not an acceleration function similar to response spectra or time history. By activating the pseudostatic option in a phase, and specifying the acceleration value in at least one of the components, these pseudo static accelerations will be activated in the. When pseudostatic analysis is not enough low frequency vibrations can normally be calculated with a pseudostatic analysis, by default available in plaxis, however for more advanced seismic analysis the dynamics module is.
Plaxis 2d dynamic loading modelling software by plaxis. In this approach, we apply a constant and uniform acceleration to all the mass in the model. Jun 22, 2009 in the pseudo static analysis, the peak ground acceleration is converted into a pseudo static inertia force and applied as a horizontal incremental gravity load. A key feature of the software plaxis 3d foundation. Second phase includes dam plastic analyses under own body load and finally the last step consists. Analyze the effects of manmade or natural seismic vibrations in soil with plaxis 2d dynamics. You can define the value per phase via the model conditions pseudostatic option in the model explorer.
The input procedures enable the enhanced output facilities provide a detailed presentation of. The plaxis interface guides you across several modes to efficiently create models with a digital geotechnical workflow. Plaxis 3d infrastructure and engineering software and solutions. The pseudostatic approach mononobe 1929 and okabe 1924 and displacement approach newmark 1965 are common and classic methodologies in practical analysis and design of retaining structures, including mse walls. Lowfrequency vibrations can normally be calculated with a pseudostatic analysis by default available in plaxis. A staged pseudostatic analysis can be completed to give consideration to this scenario. In the pseudo static analysis approach, the ground deformations are imposed as a static load and the soilstructure interaction does not include dynamic or wave propagation effects. Finite element and finite difference modeling efforts have been applied to verify the seismic design methods in practice. Fem is better for the static problem meanwhile the fdm. Plaxis 3d dynamics module can handle more advanced seismic analysis than what is available by default in plaxis and can accurately calculate the effects of vibrations with a dynamics analysis when the frequency of the dynamic load is higher than the natural frequency of the medium. Evaluation of the pseudostatic analyses of earth dams using. I need to run a pseudo static lateral analysis in which structural inertia represents the earthquake load. Plaxis how does plaxis deal with water pressures during.
Design and analysis of three different kinds of candles workflow geotechnical logical tunnel design threedimensional enter the options cad tool for calculating the structural forces of the volume of a cylinder, the size of the pile quasistatic analysis define alpha coefficient. Procedures for estimating seismicinduced permanent. Determination of a tailings storage facility capacity via. The code automates the prediction and evaluation of cracking in the dam, along the damrock interface, and in the foundation using incremental nonlinear analysis techniques based on. Low frequency vibrations can be calculated with a pseudostatic analysis. In most cases the analysis is performed on some version of the source code, and in the other cases, some form of the object code. Seismic displacement of gravity walls had been studied using conventional static methods for controlled displacement design. Pseudostatic lateral analysis technical knowledge base. Pseudostatic and pseudodynamic calculations are applied to obtain the critical acceleration. Analysis of a nailed soil slope using limit equilibrium and.
Plaxis soilvision wiki fundamentals of pseudo static analysis in plaxis. Pseudo static analysis this approach consists of performing a slope stability analysis, usually by the limit equilibrium method, where a 2d fos is computed in which a static horizontal inertial force is applied to the potential sliding. Plaxis sometimes stylised plaxis, plane strain and axial symmetry, indicating the geometric types handled in the original code is a computer programme that performs finite element analyses fea within the realm of geotechnical engineering, including deformation, stability and water flow. Evaluation of the accuracy of the pseudostatic approach is governed by the accuracy with which the simple pseudostatic inertial forces represent the complex dynamic inertial forces that actually exist in an earthquake. How to model the foundation of the structure with plaxis 3d v20 software. Fundamentals of pseudostatic analysis in plaxis plaxis. Plaxis 2d software accomplishes the analysis of retaining wall in static and seismic conditions. For geosynthetic reinforcement, it uses soilreinforcement interaction coefficients in combination with stress conditions at the slip surface to allow for bonding at the ends of the reinforcement. The effects of vibrations have to be calculated with a dynamics analysis when the frequency of the dynamic load is in the order or higher than the natural frequency of the medium. Pseudostatic analysis this approach consists of performing a slope stability analysis, usually by the limit equilibrium method, where a 2d fos is computed in which a static horizontal inertial force is applied to the potential sliding.
Plaxis 3d allows you to make safe, costefficient decisions that offer fast, comprehensive analysis methods in a userfriendly platform. Preaccepted geotechnical programme list in ascending order of valid till. Two options are available for calculating the undrained strengths prior to the application of the seismic forces. Between flac and plaxis, flac base on fdm analysis meanwhile plaxis base on fem analysis so they inheritance their parent properties. Design and analysis of three different kinds of candles workflow geotechnical logical tunnel design threedimensional enter the options cad tool for calculating the structural forces of the volume of a cylinder, the size of the pile quasi static analysis define alpha coefficient. The software is equipped with advanced features to tackle modeling challenges in. With the dynamics module plaxis can analyse the effects of vibrations in the soil. The mechanisms and the general aspects developed in pseudostatic analysis are explained in this article, along with simple examples. In this study we try to approach the gained forces by pseudostatic method according to fhwa code and gained forces from numerical modeling by finite element method, by selecting seismic horizontal coefficient for different wall height.
In plaxis 2d and plaxis 3d a pseudo static acceleration can be defined per phase in the model conditions pseudostatic option in the model explorer figure 1. In this study plain strain numerical analysis is performed using plaxis dynamic program where prescribed displacement is applied at the bottom boundary of the soil to simulate the applied seismic load. For dynamic analysis a calibrated plaxis 2d model of the reference case anchored sheet pile quay wall is created. On the use of soil drained and undrained parameters.
Pseudo static and dynamic nonlinear finite element analyses have been performed to assess the dynamic behaviour of gravity retaining walls subjected to horizontal earthquake loading. Evaluation of the pseudostatic analyses of earth dams. Researchers have also used the finiteelement method to analyze retaining systems and have developed computer software. The pseudo static approach mononobe 1929 and okabe 1924 and displacement approach newmark 1965 are common and classic methodologies in practical analysis and design of retaining structures, including mse walls. Pseudo static acceleration and model size slope stability. The numerical calculations using plaxis software involve 3 phases. In the dynamic analysis, an actual measured earthquake acceleration time history has been scaled to provide peak ground acceleration values of 0. Slope stability analysis by shear strength reduction method. Data flow analysis is one form of static analysis that concentrate on the uses of data by programs and detects some data flow anomalies.
An example of the data anomaly is the live variable problem. In this study we try to approach the gained forces by pseudo static method according to fhwa code and gained forces from numerical modeling by finite element method, by selecting seismic horizontal coefficient for different wall height. What is the best software to analyse the slope stability. 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. A staged pseudo static analysis can be completed to give consideration to this scenario. If you need only factor of safety in static condition, slide limit equilibrium based software, phase2 fem, flac fdm, plaxis fem are. Need help working from home with your bentley software. Plaxis software update archives page 3 of 5 plaxis. For people who do not own plaxis 2d 2016, but are still interested in obtaining the plaxis 2d viewer, you can download it from our knowledgebase account necessary. Software, lem, fem, slope stability, plaxis analysis of slope stability when it is subject to various types. A numerical simulation on the dynamic response of mse wall. Static program analysis is the analysis of computer software that is performed without actually executing programs, in contrast with dynamic analysis, which is analysis performed on programs while they are executing.