Abstract: The dense no viscous earth takes on the dilatancy and strain softening in course of the triaxial test. The model used in engineering extensively , such as the nonlinear elastic Duncan-Chang model and the general nonlinear elastic K-G model, do not contain the characters. According to a great deal of data by the triaxial test and research of Zipingpu Reservoir Concrete Faced Rockfill Dam’s material, the dilatancy and strain softening of the dense no viscous earth are analysed. The K-G model that contains the dilatancy and strain softening of the earth and the method to obtain the model’s parameters are introduced. The comparison between the theoretical and the experimental volumetric strain-shear strain curves verifies the rationality of the model .The model adapts to various stress path and obtains the parameters expediently, and can be used in FEM stress-strain analysis.

Key words: triaxial test, dilatancy, strain softening, K-G model