The paper presents shaking table tests utilizing big shear box to clarify pile foundation behavior in liquefaction process. It is, in principle, impossible for liquefaction process to satisfy similitude ratios in reduced models of prototype water-saturated sands in centrifugally accelerated field. Therefore, we carried out shaking table tests in near-to fullscale models of water-saturated sands and piles to break through the above-mentioned bottle neck. The effect of ground water table depth on liquefaction and pile behavior is examined. In a case of low ground water table, the liquefaction is not so severe and bending moments of piles is remarkably reduced.
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