Abstract：An improved load transfer hyperbolic model for the pile-soil interface is developed based on the conventional hyperbolic model and the results of soil structure interface(SSI) tests，which considers the increase of initial shear stiffness with the surrounding soil consolidation and loading/unloading behavior of the interface. The validity of the proposed model is proved by the good agreement between the computed results and the documental results. Further studies of the negative skin friction of single piles under different pilehead loadings and pile capacities are also conducted. The results show that the location of neutral point and distribution of skin friction of pile shaft and pile capacity vary with the surrounding soil consolidation and the pilehead loading conditions. The conclusions drawn from the study can provide valuable references for the practice.
