Abstract
Seismic stability of gravity type caisson wall is governed by external forces such as an inertia force, a dynamic water pressure and a seismic earth pressure. The amplitude and the pahse difference of these external forces depend on the dynamic soil-structure interaction during earthquake. In this study, to simulate the seismic observation records at the testing site in Kushiro port, the sliding analysis considering an initial earth pressure is conducted. The phase difference between the inertia force and the seismic earth pressure is studied from the numerical result and the observed one. Furthermore, the residual displacement observed at the 2003 Tokachi-oki earthquake is studied both from observation and numerical analysis.
