Seismic Behavior of Caisson-Type Foundation in Clayey Ground During the Earthquake Using the Centrifuge Shaking Test

摘要

In this study, the seismic behavior of caisson-type foundation in the clayey grounds is investigated by using centrifuge shaking model test. The tested ground is composed of a reclaimed liquefiable sand layer, underlain by an Holocene clay layer, a Pieistocene clay layer, and a Pleistocene gravel layer as bottom layer. As the results, it is found that the excess pore pressure ratio in the clayey ground (especially in Pleistocene clay ground) increases to about 0-1-0.2 during shaking, and that the shear strain of the clayey ground is increased to about 0.5percent - 2.0percent for Holocene and increased to about 0.2percent - 0.5percent for Pleistocene. As for the displacement of the caisson-type foundation during shaking, the sliding action in the bottom of caisson-type foundation is observed as well as the rocking action.