抄録
In this paper, inversed coefficients of subgrade reaction (kh) estimated from past horizontal load test data of single piles with wide range diameter in sand deposit are studied. As the result, reference kh (kh0) calculated with SPT blow counts (N-value) is smaller than the inversed kh0 in small N-value ground. The inversed kh0 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 kh0 based on B-1 and y/B = 0.01 is smaller than that based on the method of the AIJ recommendations.
