SHAKING TABLE MODEL TEST ON SEISMIC STABILITY OF CAISSON TYPE QUAY-WALL IN APPLICATION OF CEMENT-MIXING METHOD

Abstract

  Ground solidification techniques such as cement-mixing and permeable-grouting methods have been developed for the purpose of liquefaction countermeasure. In order to investigate the effect of ground solidification for reducing the seismic damage of caisson type quay-wall, a series of shaking table tests in 1g gravitational field was performed in terms of the combination effect of ground solidification and back-filling stone behind quay-wall. The main conclusions obtained form this study are as follows; 1) Ground solidification behind quay-wall is effective for reducing the seismic damage of quay-wall although the combination of ground solidification and back-filling stone is not useful in current experimental results. 2) The acceleration phase shift between quay-wall and solidified ground is small compared to that without ground solidification and then the seismic behavior of quay-wall sympathizes with solidified ground as if solidified ground and quay-wall are a combined structure. Consequently, the seismic earth pressure from liquefied ground is supported by solidified ground reducing the seismic earth pressure against quay-wall.