Mechanical behavior of granular media is important in many fields of studies such as the deformation of soil, slope stability, or the bearing capacity and so on. The mechanical behavior of granular media has been studied by borrowing the stress-strain models, such as elastic, elasto-plastic, or plastic models, developed for continuum materials. The aim of this research is to develop a constitutive equation taking into account the fabric tensors and their evolution modes. A modified Camclay constitutive model is effectively used, and link modern ideas of thermomechanics to void fabric tensors. After discussing the relationship between essential independent variables in constitutive equations and the state of granular materials from a viewpoint of the evolution mode of the void fabric tensors, the results show that granular materials can show less symmetry (more anisotropic). Moreover, the stress-strain relationship predicted by modified model is compared with the drained triaxial tests under the different consolidation pressures in order to assess the predictive capability. In each case good agreement with experiment is obtained.
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