NEGATIVE SKIN FRICTION ON PILES IN LAYERED SOIL DEPOSITS

A simplified numerical procedure for the analysis of negative skin fri ction on piles in a layered soil deposit is proposed. Pile-soil interf ace behavior is modeled by nonlinear soil springs. A framework for det ermining the model parameters from conventional soil tests data has be en established. This procedure is used in the back-analysis of seven w ell-documented test piles in different soil deposits. The good agreeme nt between the computed and the measured values for all seven piles co nfirmed the validity of the proposed approach.