Deformation Analysis of Anisotropic Sand Using the Method of Macromeso Incorporation

Abstract:

The deformation analysis of anisotropic sand was conducted by employing the constitutive model with the method of macromeso incorporation. A novel anisotropy state variable which is properly defined in the term of fabric tensor was imployed and a constitutive model for anisotropic sand was proposed with incorporation of the novel anisotropy state into the critical state line（CSL）. After the introduction of the novel anisotropy state, the critical state surface and other state surfaces of the model offset from the axes of hydrostatic pressure for the degree of anisotropy. The CSL, the harding rule and the dilatancy equation of model are the function of void ratio, confining pressure, shearmode and anisotropy variable. One set of model constants can simulate well the strengthdeformation responses of sand under different confining pressures and different densities. The simulation of strength experimental data and the simulation of the deformation results for Toyoura sand contained analysis of microstructure verify the proposed method can be validated from the verification.

Key words:sand; macromeso; strength; anisotropy