Abstract
In this study, we discussed a seismic behavior of caisson type seawalls for controlled waste disposal site using water proof sheets as seepage. Underwater shaking table tests with a scale of 1 to 15 model seawall were performed to examine the displacement of the caisson, the soils behind the caisson and the water proof sheet during earthquake. Long-period and long duration wave was used as an input waveform. The waterproof sheet was fixed on backfilling slope by concrete block. The results show that the behavior of the water proof sheet during shaking was closely related with the displacement of the caisson, and the residual strain in the sheet was the largest at the upper side of slope, in which the soil displacement was significant.
