An Anisotropic Hypoplastic Interface Model Considering Plane Strain Condition and Surface Roughness, and its Application in Predicting the Axial Capacity of Pile Foundation

Currently, although the plasticity framework has been proposed for the numerical modelling of pile-sand interface, the application of anisotropic hypoplasticity framework is very rare. The hypoplastic models do not need to consider the traditional plastic theory, so have been attracted wide attention. In this paper, an anisotropic hypoplastic interface model is improved by considering the plane strain state and roughness precisely, the relation between the fabric tensor and anisotropic parameters. The applicability of the improved model is validated by comparing the simulation results of existing model and the experimental data. The results indicate that the modified model can be utilized to reflect the mechanical response of sand-pile contact surface.