Abstract：An orthotropic anisotropic elastic damage model has been proposed，and the elastic deformation，damage deformation and other irreversible deformation can be identified respectively. A second rank damage tensor is used to characterize the induced damage with damage evolution being related to the propagation criteria of microcracks. A specific form of the Gibbs free energy function is used to obtain the effective elastic stiffness，and the limited scopes of relative anisotropic damage parameters are suggested based on the energy principle. A method for determining of all parameters of the anisotropic damage model is proposed by virtue of conventional triaxial test. The mechanical behaviors of different loading paths are described，such as proportional loading，lateral unloading；while the comparison between test data and numerical simulations shows an overall good agreement. Then，the anisotropic damage model is extended to describe the hydro-mechanical behaviors to simulate the coupled hydro-mechanical responses in different loading paths. The numerical results show that the proposed and extended model is suited to describe the main features of hydro-mechanical behaviors of rock.
