Application of 3-D static analysis program for residual deformation due to liquefaction

摘要

A two dimensional static FEM analysis code, ALID, was developed to calculate residual deformation due to liquefaction. This is because most damages through liquefaction are induced by the residual deformation. Both parameter setting and evaluation of results are easy in ALID; therefore it has been applied in aseismic design of river dikes. However, three dimensional structures {e.g., cylindrical tanks) must be approximately modeled in two dimensional analysis. For this reason, we introduced a methodology to a three-dimensional FDM analysis code FLAC3D. In this paper, the analysis methodology is outlined first. An analysis of the residential area is then conducted where liquefaction occurred in the 2011 off the Pacific coast of Tohoku Earthquake. We focus on the inclination and the settlement of the houses, and evaluate them from the viewpoint of the applicability of the analysis methodology in comparison to the investigation results by Tokimatsu and Katsumata (2014).