ABSTRACT
During past few decades several modifications have been proposed to enhance elasto-plastic models developed within the framework of kinematic hardening plasticity. One of the most successful approaches is to introduce one or two kinematic surfaces within a conventionally defined yield surface (Mroz et al. 1978, 1979). Models of this type are often termed kinematic hardening “bubble” models (Al-Tabbaa et al. 1987, 1989). This paper presents a new constitutive model that is capable of representing anisotropic and cyclic behaviour of clay. The model implementation is first partially verified by comparisons with the Al-Tabbaa (1987) model simulations for Kaolin clay considering isotropic material. Secondly, simulations of undrained triaxial shear tests in compression and extension highlight the effect of evolution of anisotropy on the predicted soil response.
