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A Simple Constitutive Model for Soil Liquefaction Analysis  

Park Sung-Sik (Dept. of Civil Engrg., Univ. of British Columbia)
Kim Young-Su (Dept. of Civil Engrg., Kyungpook National Univ.)
Byrne P. M (Dept. of Civil Engrg., Univ. of British Columbia)
Kim Dae-Man (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.8, 2005 , pp. 27-35 More about this Journal
Abstract
Several damages due to large displacement caused by liquefaction have been reported increasingly. Numerical procedures based on effective stress analysis are therefore necessary to predict liquefaction-induced deformation. In this paper, the fully coupled effective stress model called UBCSAND is proposed to simulate pore pressure rise due to earthquake or repeated loadings. The proposed model is a modification of the simple perfect elasto-plactic Mohr-Coulomb model, and can simulate a continuous yielding by mobilizing friction and dilation angles below failure state. Yield function is defined as the ratio of shear stress to mean normal stress. It is radial lines on stress space and has the same shape of Mohr-Columob failure envelope. Plastic hardening is based on an isotropic and kinematic hardening rule. The proposed model always causes plastic deformation during loading and reloading but it predicts elastic unloading. It is verified by capturing direct simple shear tests on loose Fraser River sand.
Keywords
Constitutive model; Liquefaction; Mohr-Coulomb; UBCSAND;
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