The anisotropic preconsolidation of clay in modelling soil-structure-interface behaviour

Contact models can be derived from existing soil models, due to similar structure-soil-interface and soil behaviour. In this work, an anisotropic preconsolidation surface from the existing anisotropic visco-hypoplasticity model is used to evaluate asymptotic shear stresses reached through undrained contact shearing. The maximum shear stresses in different inclined contact shear planes are anisotropic due to preloading which renders the soil structure anisotropic. The preloading is memorized by a tensorial state variable. An example preloading path with oedometric condition is given and the evaluation of state variables is discussed. The influence of shear plane rotation, shear rate and surface roughness are investigated.