This paper describes a series of centrifuge tests performed to study bending moments and subgrade reaction acting on sheet pile wall.s A water circulater that could be mounted on a soil container was developed to maintain water tables in both upstream and downstream sides of the sheet pile. Two types of sheet piles equipped with ten pairs of strain gauges each were prepared, and bending moments in the sheet piles induced due to net water pressure were measured. Back analysis according to the theory of beams on elastic beds was conducted to obtain the subgrade reaction. In the back analysis, a model ground having a coefficient of subgrade reaction proportional to depth was assumed. The best fit values of the coefficient of the rate of increase of subgrade reaction along depth k_1 were determined. The results of the back analysis showed that the rate k_1 dependen on the the ratio of differnetial head relative to penetration depth of the sheet pile #DELTA#H/D. The expression representing the rate k_1 will be suggested i nthis paper.
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