Abstract
In order to evaluate the bearing capacity of closed end screwed pile with spiral wings, installation and loading tests were executed in uniformly graded sand in a calibration chamber. The experimental factors include the spiral wing diameter Dw (Dw/Dp=1.4-1.7, Dp :pile diameter) and the spiral pitch P (P/Dw=0.8-1.2). The test results and discussions have shown that : (1) The bearing capacity of the pile can be determined by the shear strength of cylindrical surface whose diameter is Dw, (2) There is a fairly-well defined correlation between skin bearing capacity and installation torque, and (3) The skin bearing capacity can be estimated using the torque acting on the pile shaft.
