HAZARD MAP FOR LIQUEFACTION BY 3D SEISMIC RESPONSE ANALYSIS USING THE SUPERCOMPUTER “FUGAKU”

Abstract

 In the process of hazard mapping for liquefaction, it may be desired to use seismic response analysis with 3-D FEM for advanced prediction of liquefaction of large areas. However, the construction cost and calculation cost of the 3D FEM model are still too high to apply the method in practice. To solve these problems, the authors have developed “T-STRIKE”, a large-scale nonlinear finite element method program. This program incorporates constitutive laws for soil liquefaction. To verify the validity of the liquefaction hazard map using the developed program, we conducted a seismic response analysis with liquefaction on a real site using the supercomputer “Fugaku,” and the results were compared with those of other programs that have been used in practice. In addition, the results were compared with those of a one-dimensional horizontally layered ground model to demonstrate the usefulness of the 3-D analysis.