Abstract
The purpose of this study is to investigate the damage process of a group-pile foundation adjacent to a quay wall in a reclaimed ground during the 1995 Hyogo-ken Nanbu earthquake. A five stories building supported by the foundation tilted toward the sea due to the damage of the pile foundation. Sand boiling and large lateral flow of the liquefied ground occurred around the building. Two-dimensional and three-dimensional effective-stress analyses with the soilpile-building system were preformed. The ground was assumed to consist of a cyclic elasto-plastic model for sand and a cyclic elasto-viscoplastic model for clay. Both two-dimensional and three-dimensional analyses quantitatively reproduced the observed deformation of damaged piles. The numerical results showed that an inertia force of the building damaged the pile head, while a large horizontal deformation of the surrounding soil damaged the deeper parts of the pile before the ground liquefied completely.
