LE HONG NGUYEN
Non-linear Analyses of Earthquake Resistant of Railroad Embankments Structuresby Rigid Plastic Finite Element Method
Ohtsuka SATORU
Mononobe and Matsuo and Okabe proposed a method to determine lateral earth pressure of granular cohesion less soils during earthquake. Because of the old age of M-O method, a lot of studies have been focused on this area. However, Rigid Plastic Finite Element Method has never been applied in this topic. The objective of this research is to explore the active earth pressure during earthquake by using Rigid Plastic Finite element analysis.
This method is considering the pressures to act on virtual retaining walls. Because of the direction of considered pressures and the direction of soil displacement cause by the passive earth pressure are the same, the passive earth pressure can be calculated by using the limit theorems. However, soil displacement cause by the active earth pressure move in opposite direction. So we cannot use limit theorems for calculated active earth pressure. This research is considering the pressures to act on a virtual retaining walls and also using Rigid Plastic Finite Element Method for calculating safety factors of soil slope stability. And when safety ratio becomes 1, the active earth pressure on the wall will be estimated. From the comparison of active earth pressureˇˇcalculated from analytical theories and Rigid Plastic Finite element analysis, results from M-O method show the compatibility to the Rigid Plastic Finite element analysis, for theˇˇmagnitude and distribution of active earth pressure.
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