抄録
This paper is concerned with the yield condition of cohesionless granular materials with fabric anisotropy. The proposed yield condition is based on a physically motivated assumption that plastic slips will occur when the stress ratio on the contact plane, which has information about fabric anisotropy, with respect to a suitably specified slip plane becomes a critical value. The quantities involved in the proposed yield condition are given in terms of the contact and modified stress tensors. It is shown that two familiar yield conditions for an isotropic granular material are obtained as special cases of the present study and they can be naturally converted into the anisotropic yield condition by using the contact and modified stress tensors. The behavior of the proposed yield condition is determined by two fundamental factors : (1) the selection of referential slip plane ; (2) the degree of fabric anisotropy. These two factors are examined based on numerical calculation results. The shape change of the yield condition during triaxial loadings is also evaluated.
