Abstract:

The load transfer and deformation behavior of the short pile foundation is studied by the experimental and numerical analysis of a case history of six-story building in the lacustrine deposits. The test results show that the real bearing capacity of pile is more than 1.6 times of that calculated by Shanghai codes and the observed settlement of pile foundation is less than the predicted value. The interactive behavior between the piles and subsoil is analyzed by measuring the contact pressure under footing, which shows that the bearing capacity of shallow subsoil is neglected. The stress increase and deformation in the soil are obtained by numerical analysis of the short pile-soil interaction. The results show that the settlement of the short pile foundation is mainly caused by the compressiom of the soil under pile bottom, and reduced by the stress diffusing in the shallow leck which is the bearing layer of pile.

Key words: short pile, pile-soil interaction, load transfer, deformation, in-situ test, numerical analysis