COEFFICIENT OF SUBGRADE REACTION ESTIMATED FROM HORIZONTAL LOAD TEST DATA OF SINGLE PILES WITH WIDE RANGE DIAMETER IN SAND DEPOSIT

Abstract

In this paper, inversed coefficients of subgrade reaction (k_h) estimated from past horizontal load test data of single piles with wide range diameter in sand deposit are studied. As the result, reference k_h (k_h0) calculated with SPT blow counts (N-value) is smaller than the inversed k_h0 in small N-value ground. The inversed k_h0 obtained from the values at y/B = 0.01 (y: pile displacement, B: pile diameter) has good correspondence with the test data than that obtained from the values at y = 1cm. Further, the variation of the calculated k_h0 based on B^-1 and y/B = 0.01 is smaller than that based on the method of the AIJ recommendations.