Abstract
The constitutive model for explaining non-linear deformation mechanism of granular materials was presented by the Authors. Elliptic microstructure composed of particles in granular materials is focusedas a unit of microstructure. In the model, the macroscopic behavior of heterogeneous granular material is assumed to be controlled by the elliptic microstructures and the interactions among them. In this paper, therelation between size of microstructure and size of constituent particle is investigated with stability conditions of the structures. And the deformation behavior of granular materials with different initial fabric under shearing are examined based on the mechanism of fabric change such as collapse and revival of the microstructures. The proposed constitutive model has the capacity to explain the mechanism of non-linear deformation including the effect of initial fabric on stress-induced anisotropy and dilatancy in a unique manner based on the elliptic microstructure model.
