Abstract: Based on the Goodman contact element, we improve the Bingham model on the basis of the Clough-Duncan hyperbolic equation to establish an elastic-visco-plastic constitutive model for soil-structure interface. This soil-structure interface model is developed by the FRIC subroutine of ABAQUS. A series of long-term interface shear tests are performed to verify the above model by using the stress controlled soilstructure interface shearing test apparatus. The results show that the established model is able to effectively simulate the mechanical behavior and time effect of soil-structure interface; the normal stress has greater effect on the mechanical behavior of the soil-structure interface, and the larger the normal stress, the more obvious time effect of the interface is.