The analysis for the embankment and sand mat were modelled as drained condition while for all the foundation clay soil was modelled as undrained condition. The reduction factor is suggest to be the safety factor of the slope at the moment when the slope reaches instability, the numerical nonconvergence occurs simultaneously. Please like and subscribe for an nguyens channel to watch the new videos. Investigation of stone columns role in reinforcing. Embankment stability is calculated by means of phic reduction. It is intended for practising engineers who do already have some prior experience in using plaxis products and who are willing. A slope without piles is considered first and the limit state equation is obtained to determine both the safety factor and the critical sliding surface. Using shear strength reduction method for 2d and 3d slope stability analysis thamer yacoub, ph. The mohrcoulomb model was used as a simple first analysis of the problem considered. The limit equilibrium software, slopew, and the fe program plaxis are two.
Analysis of a nailed soil slope using limit equilibrium. Stability analysis of slopes using the finite element method and. The advantage of a finite element approach in the analysis of slope stability problems over traditional limit equilibrium methods is that no assumption needs to be made in advance about the shape or location of the failure surface, slice side forces and their directions. The slope stability analysis is performed with the limit equilibrium method based on assumptions about the slid ing surface shape. Acces pdf plaxis 3d 2012 tutorial manual plaxis 3d 2012 tutorial manual. This paper aims to analyze slope stability based on the numerical simulation using plaxis software. Analysis of embankments with different fill materials. Slopes, seepage, factor of safety, failure slip circle, slope 1plaxis. The number of equations of equilibrium available depends on the number of slices n and the number of equilibrium conditions that are used. Plaxis is used worldwide by top engineering companies and institutions in the civil and geotechnical engineering industry. Simplicity and relatively good results are the advantages of these methods. Slope w and plaxis are two common software programs currently employed by geotechnical engineers within australia and other countries. The stability of a slope with reinforcing piles in anisotropic and nonhomogeneous soils is analyzed using the kinematic approach of limit analysis combined with a strength reduction technique. When coupled with other geo slope software products, it can also model the porewater pressure generation and dissipation in a soil.
They are certainly major factors in cut slope stability and in the stability of fill slopes involving both internal and external slope. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. 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 climate is represented by precipitations rate, precipitation duration, and the stability of this unsaturated slope in natural terrain was evaluated based onakey indicator which is safety factor. Plaxis and slopew and their use in geotechnical stability analysis. Plaxis2d, plaxis3d and slope w in simulating and stability analysis estimation of embankments founded on clay deposits. Slope stability using plaxis slope stability engineering. This video will help the user understand the workflow in gts nx and plaxis for a simple 2d slope stability analysis. Four case configurations were studied for the stability analysis. Thereby, in all modeling the load of 50 kpa with its center in the middle of upper surface of slope is used. Keywords slope stability, plaxis 2d, fill materials i. The analysis is carried out on two slope angles of 45 and 60, which are reinforced with nails at three different inclinations of 0,15 and 30 respectively. This article analyze the slope stability by strength reduction method named phic which supplied by fe software plaxis. Most of the computer programs used for slope stability analysis are based on the limiting equilibrium approach for a two dimensional model, this analysis was conducted.
In this study, three types of sequence modeling were conducted. The stability analysis of the road embankment has been done by finite element method using plaxis 2d. Slope stability, finite element method, drained condition. Conclusions and sugestions through data analysis of slope stability that occurring in piyungan, yogyakarta with the manual method fellenius and plaxis program v8.
Is it possible to use plaxis and slopew for a project at. Software, lem, fem, slope stability, plaxis analysis of slope stability when it is subject to various types i. In this method shear strength is considered to be reduced as less as failure occurs. Also a brief introduction and working principles of the software is discussed. Using shear strength reduction method for 2d and 3d slope. Present slope study includes the homogeneous soils, as well as slope section with different soils layers. Slope stability problems have been faced throughout history whenever the delicate balance of nature has been disturbed by any kind of internal or external forces.
I would like to know if someone can help me with the shortcomings of this program or where i can find information about it. This research uses the shear strength reduction method to study soil slopes stability. Introduction slope is the one which is inclined and unsupported mass. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Stage 4 the safety factor rate sf can be seen as follow. First, the stability of road embankment without any reinforcement was analyzed. Slope stability analysis by shear strength reduction. Table 12 summary of fos results simple homogeneous soil slope. Pdf slope stability analysis using numerical modelling.
Materials and methods according to above material, this research is based on modeling the role of stone columns in stability of coastal slopes. Slope stability evaluations by limit equilibrium and. When the slope geometry and subsoil conditions have been determined, the stability of a slope maybe assessed using computer analysis. The purpose of this research project is to compare the student versions of flac, plaxis and slope w and their use in geotechnical stability analysis.
Pdf slope stability analysis for undrained loading. Plaxis 2d for stability assessment of a slope strengthening close to existing railway tracks. Plaxis workshop on slope stability in plaxis plaxis. For example, you can perform a simple linear elastic deformation analysis or a highly sophisticated nonlinear elasticplastic effective stress analysis. Piles have been used successfully in many situations in order to stabilize slopes or to improve slope stability, and numerous methods have been developed for the analysis of piled slopes ito et al. Twodimensional slope stability analysis by plaxis2d ijraset. Plaxis geotechnical finite element analysis software. The mechanical parameters of soil layers constituting the slope are evaluated from laboratory. Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement. However, numerical analysis are based on complex mathematical theories to reach a result which with the new advances in technology as more accessible softwares, friendlier userinterfaces, and faster computers, specialized. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. Stability analysis of gravity wall using plaxis 2d v. The work has involved analysis and comparison of the stability through estimate of the sf and the critical failure surfaces obtained through 2d and 3d programs. Enhance your designs for monopile foundations with plaxis.
Geotechnical stability analysis using student versions of. Slope w and plaxis are used for the limit equilibrium and fe methods, respectively. Pm analyses may estimate 5 14% higher fos, depending on the conditions of a dry slope and a fully saturated slope with hydrostatic pore pressure. Perform 2d analysis of deformation and stability in geotechnical engineering with plaxis 2d suite, a powerful finite element package that includes specialized modules for vibration, groundwater analysis, and heat flow. Soil slope stability analysis 339 isfied for each and every slice, it is also satisfied for the entire mass. Both the slope angles and all nail inclinations are taken from the. An introduction on the use of plaxis 3d for slope stability will also be provided. Introduction slopes either occur naturally or are engineered by humans. Plaxis 2d online training stability analysis soil reinforcement railway tracks plaxis online training. Plaxis 2d and 3d are powerful and user friendly finite element package intended for twodimensional and threedimensional analyses of deformation and stability in geotechnical engineering and rock mechanics. Chapter 9 embankments washington state department of. Pm analyses may estimate 5 14% higher fos, depending on the conditions of a dry slope and a fully saturated slope. Calculation of slope stability manually withfelleniusmethod b.
This online training will demonstrate the practical use of plaxis 2d for the stability assessment of a slope strengthening close to existing railway tracks. Limit analysis of the stability of slopes reinforced with. Besides giving courses they are also daily involved with the users through the support department. Similarly, stability check for existing slopes will be done and then factor of safety and failure slip circle will be computed using plaxis 2d. The lecturers have a long time experience with the use of plaxis software.
Basic analysis of homogenous slope stability by finite. Consolidation analysis road embankment with sand drains this plaxis 3d tutorials are all. The finite elements software plaxis 2d version 2015 was used to analyze the stability of the slope. Numerical analysis of climate effect on slope stability. 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. Calculationof slope stability by using plaxis2d v8.
An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls using finite elements and limit equilibrium. A comparison of results is made for both the software. If sf slope stability analysis after treatment consists of two ways, namely. Some procedures are available for the analysis of rapid. This workshop is tailored towards practitioners in the industry to provide a good understanding of the use of plaxis programs both 2d and 3d in the field of slope stability and factor of safety. The analysis is carried out with plaxis fe program, plaxis, 2002 it is important for the stability of the slope to model the section to the lowest quotes reached at the river flow. Analysis of geotextile reinforced road embankment using. The major limitations of this method are found from this comparative study. Slope w is a limit equilibrium method of slope stability analysis which assesses the fos against slope instability. The stability condition of slopes is a subject of study and research in soil mechanics, geotechnical engineering and engineering geology. Slope stability evaluations by limit equilibrium and finite. Twodimensional 2d, plane strain fe modelling is carried out as shown in fig. Plaxis finite element software for geotechnical computations.
Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rockfill dams, embankments. The principles of the factor of safety analysis with plaxis strength reduction method slope stability with the use of structural elements. 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. Pdf slopes stability analysis using the plaxis 2d program and. Pdf this paper aims to analyze slope stability based on the numerical simulation using plaxis software. Introduction for slope stability analysis, the limit equilibrium method lem is widely used by engineers and researchers and this is a traditional. Twodimensional slope stability analysis by plaxis2d. Pdf slopes stability analysis of regular and artificial slopes is a testing soil mechanics issue. Plaxis 2d suite perform 2d analysis of deformation and stability in geotechnical engineering with plaxis 2d suite, a powerful finite element package that includes specialized modules for vibration, groundwater analysis, and heat flow. These methods remain popular because of their simplicity and the reduced number of parameters they require, which are slope geometry, topography, ge ology, static and dynamic loads, geotechnical parameters. Plaxis is a finite element method where we can model the slope to assess the. The position of sliding surface and dynamic simulation of instability can be obtain as well.
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