A framework of an anisotropic elastoplastic model for clays

A framework of an anisotropic elastoplastic model is proposed that has potential applications to different types of clays. The model adopted the form of work dissipation based yield surface of Dafalias. A surface configuration parameter is introduced to the yield surface in addition to that of the plastic potential surface. This idea was motivated by the fact that different types of clays may have a reasonably close slope of critical state line in stress space but different shear strengths. The resulting yield surface is compared with yield surface data for 17 natural clays. The overall level of agreement is satisfactory.