Abstract

On Hyogoken-Nanbu-Earthquake (1995.1.17), the filling moved in the direction of the old valley in Nishinomiya City. Some buildings in the area were largely damaged. This report is the results of the observation on the damage of precastconcrete piles (diameter : 0.35m, length : 5m) on a damaged building. The piles were broken at pile-top mainly in the direction of column row. So, we estimate that the collapse of the piles occured by the inertia force of superstructure mainly in the direction of column row. The retaining walls on the western side in the area were largely damaged. On the other hand, those on the eastern side were safe except one. We estimate that in the case of the earth pressure increasing by filling movement, the retaining walls were damaged, but in the case of the earth pressure decreasing, they were safe.