Abstract
ABSTRACT In the present paper the authors attempted to evaluate quantitatively the screening effect of reinforcement piles in sand backfills by centrifuge model tests. A thin steel plate and a perspex plate with a hinge at the bottom were used as model walls. The reinforcement consisted of thin steel bars tied at the top and bottom. The ratio of the diameter of the pile to the spacing of piles was varied. The model tests were carried out under 30 g of centrifugal acceleration with the measurement of total force on the wall and the observation of failure mechanism in the backfill. From the tests with no reinforcement in the backfill, it was found that the failure mechanism and the total force on the wall compared well with the prediction by the Rankine theory on the basis of the angle of shearing resistance deduced from the plane strain shear tests. The screening effect observed for the present tests was considerably smaller than that reported by other workers, and it was larger for the smaller diameter of the piles. The difference of flexural regidity of one order did not give rise to any significant difference in the screening effect.
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