Abstract
Dynamic behavior of an actual soil-pile-structure system during earthquake has been investigated using centrifuge model tests in order to check its stability against soil liquefaction and particularly the effect of liquefaction on the stiffness of group piles and its between soil. The model of this system, being composed of a 4x4 pile supported structure and a sand deposit, was precisely constructed in a larger laminar container. It was found that the pile foundation has no obvious efficiency in protecting the soil from liquefaction. The system, however, showed a sufficient capacity against soil liquefaction for a seismic input level of 175gal. This study also confirmed that dynamic centrifuge model test technology is a very powerful tool for evaluating seismic stability of actual soil-pile-structure systems.
