The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Smit Kamal - One of the best experts on this subject based on the ideXlab platform.
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Stability of an Embankment on Soft Consolidating Soil with Vertical Drains
Geotechnical and Geological Engineering, 2016Co-Authors: Agrahara Krishnamoorthy, Smit KamalAbstract:Stability of an embankment constructed on soft consolidating soil improved with pre-fabricated vertical drains is investigated. The Factor of Safety of the embankment is obtained at various time intervals from the end of construction till the end of consolidation in order to check the embankment stability. Finite element method is used to obtain the effective stresses at required points in soil at various time intervals. Critical slip surface is obtained using two methods. In the first method, the critical slip surface is assumed as an arc of a circle selected among various probable slip circles with minimum Factor of Safety whereas, in the second method, a random walking type Monte Carlo technique is used to predict the critical slip surface. The effects of providing vertical drains on stability of an embankment is investigated by comparing the Factor of Safety of slope with vertical drains to the Factor of Safety of slope without vertical drains. It is concluded from the study that the installation of vertical drains enhances the Factor of Safety of the embankment from the end of construction till the end of consolidation.
Agrahara Krishnamoorthy - One of the best experts on this subject based on the ideXlab platform.
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Stability of an Embankment on Soft Consolidating Soil with Vertical Drains
Geotechnical and Geological Engineering, 2016Co-Authors: Agrahara Krishnamoorthy, Smit KamalAbstract:Stability of an embankment constructed on soft consolidating soil improved with pre-fabricated vertical drains is investigated. The Factor of Safety of the embankment is obtained at various time intervals from the end of construction till the end of consolidation in order to check the embankment stability. Finite element method is used to obtain the effective stresses at required points in soil at various time intervals. Critical slip surface is obtained using two methods. In the first method, the critical slip surface is assumed as an arc of a circle selected among various probable slip circles with minimum Factor of Safety whereas, in the second method, a random walking type Monte Carlo technique is used to predict the critical slip surface. The effects of providing vertical drains on stability of an embankment is investigated by comparing the Factor of Safety of slope with vertical drains to the Factor of Safety of slope without vertical drains. It is concluded from the study that the installation of vertical drains enhances the Factor of Safety of the embankment from the end of construction till the end of consolidation.
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Factor of Safety of slope on consolidating soil with vertical drains by finite element method
International Journal of Geotechnical Engineering, 2013Co-Authors: Agrahara KrishnamoorthyAbstract:Factor of Safety of a slope on soft consolidating soil incorporating vertical drains is obtained at various time intervals. Effective stresses in soil are obtained using finite element method and the critical slip surface is located using efficient Monte Carlo technique. Factor of Safety of the slope on consolidating soil with vertical drains is compared with the Factor of Safety of the slope on consolidating soil without vertical drains at various time intervals. In addition, the effect of spacing of vertical drains on the Factor of Safety of slope is also studied. It is concluded from the study that the installation of vertical drains accelerates the consolidation process during and after the construction period and the maximum Factor of Safety can be achieved in lesser time due to vertical drains. The time required to achieve the maximum Factor of Safety increases as the spacing of drains increases.
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Factor of Safety of a Consolidating Slope by Finite Element Method
2010Co-Authors: Agrahara KrishnamoorthyAbstract:Factor of Safety of a consolidating slope is obtained at various time intervals using finite element method. Four noded isoparametric plane strain element with two translational degrees of freedom is used to model the soil deformation. Pore pressure in soil is also modeled using four noded isoparametric element. Displacement and pore pressure in soil are coupled and the resulting equations are solved to obtain the displacement and pore pressure in soil at various time intervals from the beginning of consolidation up to the end of consolidation. Effective stresses in soil are obtained using finite element method whereas the critical slip surface and Factor of Safety of a slope is obtained using a Monte Carlo technique. The analysis is used to obtain the Factor of Safety, pore pressure and effective stresses in soil at various time intervals. It is concluded from the study that the method of combining the finite element method to determine effective stresses and Monte Carlo technique to determine the critical slip surface is simple and can be used to obtain time Factor of Safety of a consolidating slope at various time interval.
Andrew C. Heath - One of the best experts on this subject based on the ideXlab platform.
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Effect of earthquake loading on tension cracks and Factor of Safety in slope stability analyses
2005Co-Authors: A R Zolfaghari, Andrew C. HeathAbstract:Seismic loading and ground water pressures are two major Factors contributing to slope instability. Earthquake shaking can increase shear stresses in soils and thereby reduce the Factor of Safety. In addition, earthquake loading can influence the shape of failure surface, particularly when tension cracks are present. In cohesive materials, a tension crack often occurs at the crest of slopes and the depth of this crack can be influenced by earthquake loading as depth of tension crack can be related to the Factor of Safety. In this study, the effect was studied for non-circular failure surfaces using a simple genetic algorithm and the Morgenstern-Price method. Analysis shows that as the peak horizontal acceleration due to earthquake loading increases, the depth of tension crack increases and the Factor of Safety decreases. The effect of seismic loading on the shape of non-circular failure surfaces is also illustrated.
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Effect of earthquake loading on tension cracks and Factor of Safety in slope stability analyses
2005Co-Authors: A R Zolfaghari, Andrew C. HeathAbstract:Seismic loading and ground water pressures are two major Factors contributing to slope instability. Earthquake shaking can increase shear stresses in soils and thereby reduce the Factor of Safety. In addition, earthquake loading can influence the shape of failure surface, particularly when tension cracks are present. In cohesive materials, a tension crack often occurs at the crest of slopes and the depth of this crack can be influenced by earthquake loading as depth of tension crack can be related to the Factor of Safety. In this study, the effect was studied for non-circular failure surfaces using a simple genetic algorithm and the Morgenstern-Price method. Analysis shows that as the peak horizontal acceleration due to earthquake loading increases, the depth of tension crack increases and the Factor of Safety decreases. The effect of seismic loading on the shape of non-circular failure surfaces is also illustrated.
Katrin Walter - One of the best experts on this subject based on the ideXlab platform.
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A Comparative Study of Different Approaches for Factor of Safety Calculations by Shear Strength Reduction Technique for Non-linear Hoek–Brown Failure Criterion
Geotechnical and Geological Engineering, 2012Co-Authors: Sukanya Chakraborti, Heinz Konietzky, Katrin WalterAbstract:The shear strength reduction technique is becoming more and more popular to determine the Factor-of-Safety for geotechnical constructions, especially for slopes. At present, two in principal different procedures are used to apply the numerical shear strength reduction technique for materials characterised by non-linear failure envelopes, like the Hoek–Brown criterion. One procedure is based on the determination on local stress and strength values, whereas the other is based on a global linearization of the non-linear failure envelope. This article shortly describes and discusses these two different procedures and compares results for a broad spectrum of parameter constellations based on slope stability calculations. The local approach is physically more correct. The global approach can be considered as a first approximation. A comparison of both methods reveal that the global approach in comparison to the local approach, can leads to a deviation of up to 15 % in both directions. If one considers the local approach as the ‘correct’ one, depending on the parameters the results of the global approach can lie on the safe or unsafe site. The practical conclusion is that evaluation of slope stability using the global approach can result in uneconomic slope design or overestimation of Safety margin. The use of the local approach instead of the global should be preferred. In case of small Safety margins (e.g. 20 % or less) the use of the local approach is strictly recommended.
A R Zolfaghari - One of the best experts on this subject based on the ideXlab platform.
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Effect of earthquake loading on tension cracks and Factor of Safety in slope stability analyses
2005Co-Authors: A R Zolfaghari, Andrew C. HeathAbstract:Seismic loading and ground water pressures are two major Factors contributing to slope instability. Earthquake shaking can increase shear stresses in soils and thereby reduce the Factor of Safety. In addition, earthquake loading can influence the shape of failure surface, particularly when tension cracks are present. In cohesive materials, a tension crack often occurs at the crest of slopes and the depth of this crack can be influenced by earthquake loading as depth of tension crack can be related to the Factor of Safety. In this study, the effect was studied for non-circular failure surfaces using a simple genetic algorithm and the Morgenstern-Price method. Analysis shows that as the peak horizontal acceleration due to earthquake loading increases, the depth of tension crack increases and the Factor of Safety decreases. The effect of seismic loading on the shape of non-circular failure surfaces is also illustrated.
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Effect of earthquake loading on tension cracks and Factor of Safety in slope stability analyses
2005Co-Authors: A R Zolfaghari, Andrew C. HeathAbstract:Seismic loading and ground water pressures are two major Factors contributing to slope instability. Earthquake shaking can increase shear stresses in soils and thereby reduce the Factor of Safety. In addition, earthquake loading can influence the shape of failure surface, particularly when tension cracks are present. In cohesive materials, a tension crack often occurs at the crest of slopes and the depth of this crack can be influenced by earthquake loading as depth of tension crack can be related to the Factor of Safety. In this study, the effect was studied for non-circular failure surfaces using a simple genetic algorithm and the Morgenstern-Price method. Analysis shows that as the peak horizontal acceleration due to earthquake loading increases, the depth of tension crack increases and the Factor of Safety decreases. The effect of seismic loading on the shape of non-circular failure surfaces is also illustrated.
