Abstract:Using the Eshelby equivalent inclusion method,a statistical constitutive model for elastoplastic and damaged rock is set up,which can reflect the relation between stress and strain and the relation between axial strain and traverse strain before the rock fails. The hypothesis that the relation between the total strain and the strains in phases and the relation between the total stress and the stresses in phases are different is empoyed. An optimization method is developed to determine the parameters of the constitutive model. The presented model is verified by the experiments.