Abstract
A series of vertical and horizontal loading tests were conducted on the existing piles constructed in Hokkaido, in order to evaluate the bearing capacity and deformation characteristics of piles in volcanic ash grounds. Static cone penetration tests were also performed at the same sites. From test results, the skin friction f of piles in the welded pyroclastic fall deposit tends to decrease compared with that of sandy soil. A correlation was between the cone point resistance qt and skin friction f. It was also indicated from CCP and SPP tests that the normalized coefficient of horizontal subgrade reaction could be estimate from the pile deformation at the ground surface.
