Applicability of Simple Method to Piled Raft Analysis in Comparison With Field Measurements

Abstract

An applicability of the simple method of the combined pile group and raft method proposed by Clancy and Randolph (1996) to piled raft analysis was examined through comparisons with the field monitoring results from four case histories in Japan. To deal with multi-layered soils with finite depth, the simple method was modified using the Steinbrenner’s solution. The shear modulus of soil used in the analysis was determined by degrading the shear modulus at small strains using a reduction factor, where a set of reduction factors were employed in Case 2 while a single reduction factor was used in Case 1. Consequently, it was found that the presented approach based on the method of Clancy and Randolph gave an approximate average settlement and load sharing between the pile group and the raft, when the reduction factor of shear modulus was 0.4 in Case 1 and 0.3 in Case 2.