Abstract:
It is necessary to verify the reliability and rationality of a liquefaction numerical analysis method before its application to engineering safety assessment. In this study, the nonlinear finite element procedure GEODYNA based on
u-p form Biot dynamic consolidation equations and the generalized plastic model of liquefiable soil modified by Dalian University of Technology are used to conduct a dynamic effective stress analysis of the centrifuge model test in the liquefaction experiment and analysis project (LEAP). The results show that the acceleration response spectrum and the acceleration time histories computed by the numerical method are basically consistent with the experimental data. The accumulation, development and dissipation principle of the excess pore pressure in the centrifuge model test are well reproduced by the numerical simulation. The development of soil stress paths and the soil dilatancy effect under cyclic shear loading are generally captured in the simulation. The accumulation and development process of residual deformations is reasonably reflected by the numerical simulation and the deformation distributions of the slope ground obtained by the numerical simulation are in good agreement with the test data. The reliability of the liquefaction numerical analysis method employed is verified, which ensures that it shall become an effective numerical method for engineering liquefaction safety assessment.