Two-Dimensional Effective Stress Analysis of Liquefaction of Irregular Ground Including Soil-Structure Interaction

An effective stress method is presented for analysis of seismic response and liquefaction of irregular ground including soil-structure interaction, based on an implicit-explicit finite element method. A pore water pressure is computed with iteration from the total stress considering undrained condition. The simulated pore water pressure is in reasonably good agreement with experimental data. The proposed method of analysis is compared with other well-known methods for one-dimensional model, which is in good agreement. The present effective stress method is also applied to liquefaction problem involving two-dimensional soil-structure model. The numerical results are considered to be significant from the viewpoint of earthquake engineering.