"This research provides an overview of the basic of plaxis in modeling dynamic problems, by using plm constitutive model . the imperial valley earthquake case history is used in this study. for the case studied in this research, the following conclusions may be drawn: 1- The presented is model capable of simulating the liquefaction phenomenon. 2- The plm model proved to capture successfully the characteristics of soil liquefaction. 3- The model builds the main mechanisms ( increasing pore-water pressure ) of liquefaction. 4- for the same soil layers, the earthquake type has a significantly effect on the value of excess pore-water pressure. 5- When the liquefied sandy soil layers were improved with the stone column, the lique faction of the soil was greatly reduced. 6- After improving soil with gravel drain , it was observed that the soil properties improved, the bearing capacity os soil improved and total vertical displacement decreased. 7- Total stresses and effective stresses of soil were reduced after soil improving by using gravel drain." by Marawan M. Shahien M. Shahein, ahmed nasr et al.
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Journal of Engineering Research

Journal of Engineering Research

Abstract

Liquefaction is one of the most dramatic defects of granular soil. This phenomenon is mostly observed when loose sand is subjected to a dynamic load or earthquake. In this study, the liquefaction that affected the loose soil evaluated, and some recommendations are introduced. (2-D) Numerical analysis using Plaxis (8.2) was conducted to simulate the behavior of the loose soil under dynamic loads. The studied model was carried out on multi-layers soil supported by stone columns subjected to dynamic loads. It was found that stone columns enhanced the soil behavior and reduced the damage that occurred. Liquefaction of the loose soil could be constrained by increasing the shearing parameters of the soil. The damages of a dynamic load are time-dependent, so the corresponding damage increases as the time of the applied dynamic load increases. Moreover, the many straining actions are evaluated, and a comparative study is introduced, such as access pore water pressure, total vertical displacement, deformation of soil, and velocity.

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