Abstract: Vertical additional force outside surface of the shaft lining caused by dewatering settlement of bottom aquifer in the thick alluvium induced shaft fracture in east china. The study on sheafing property of interface between soil and structure under high stress is key to solve this engineering problem. A series simple shear tests about interface were carried out on the manufactured, modified simple shear system under high stress. The analysis of testing data demonstrates that the relationship of stress and shearing displacement can be described as nonlinear elastic-ideal plastic model, and that the strength criterion of interface accords with Mohr-Coulomb through origin.