Abstract: Abstract:On the basis of irreversible thermodynamic theory,an elastoplastic anisotropic damage constitutive model is presented by introduction of a plastic potential function considering the volume change of frozen soil. The anisotropic damage evolution equation is derived from the damage accumulated potential function, which is constructed in the space of the damage strain energy release rate that is conjugated with damage tensor. Triaxial tests are chosen to illustrate the application of this model,and good agreement between experimental data and numerically simulated ones is obtained. The calculated results indicate that the amount of elastic damage only accounts for a small percentage of total structural damage of frozen soil,and most part of damage takes place during the plastic deformation phase. The increase in confining stress can strengthen the structure and reduce the amount of total damage of frozen soil.