Influence of Soil Nonlinearity and Liquefaction on Dynamic Response of Pile Groups

Abstract eng:
Nonlinearity of soil media plays an important role in soil-pile interaction problems. Moreover, during strong excitations, the soil may liquefy and this drastically affects the response of pile groups. In this study, a simple elasto-plastic constitutive model (the Drucker-Prager soil model) has been used to investigate the effect of soil nonlinearity in a three-dimensional soil-pile system. The model for the soil-pile system is idealized using 3-D finite elements. Kelvin elements are used at the boundary, simulating radiation conditions at infinity. The model and process of computation is verified using established results in literature. To investigate the effect of liquefaction, effective stress approach has been adopted. The soil medium has been considered undrained so that the pore pressure may develop. The study has been performed for single pile as well as for pile groups. First, the effect of nonlinearity on the dynamic stiffness of the soil-pile system has been examined. Next the study has been extended for probable liquefaction in the soil medium.

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