A seismic response calculation of the landslide considering the effect of the excess pore water pressure

-Simulation for the landslide in Higashi-Takezawa, old Yamakoshi village-

Abstract

Mid Niigata Prefecture earthquake has induced numerous landslides, and hence it has become at most importance to study the mechanisms of these earthquake-induced landslides. Among many landslides, the soil mass of the landslide in Higashi-Takezawa area traveled long distance and consequently caused clogging of the Imo River. A particular emphasis has been placed on the study of the mechanisms of this landslide to examine whether rise in the pore pressure has been one of the controlling mechanisms of the failure. However, no conclusive results have been reported so far to clarify the effects of the pore pressure. In this study, FEA has been performed with analysis code LIQCA to assess the potential mechanism of landslide deformation due to excess pore water pressure. The results of the simulation suggest that rise in pore pressure may be one of the potential mechanisms of this particular landslide.