Analysis about Effect Factors on the Shearing Characteristics of the Interface between Sand and Structures

Vertical additional force outside surface of the shaft lining caused by dewatering settlement of bottom aquifer in the thick alluvium induces shaft fracture in east China.In order to solve this engineering problem effectively,the influential factors of vertical additional force are studied by use of the simple shear apparatus.The orthogonal tests about interface between saturated/dry coarse sand,saturated/dry fine sand and steel/concrete are carried out at the manufactured,modified simple shear system.The testing result shows that the conditions(dry or saturated) have more significant effect on the shear strength than soil type or base,and the conditions(dry or saturated) and base are significant factors of initial shearing stiffness.Grain breakage is comprehensive reflection of influence from three factors on shearing characteristics of the interface.