Development of Constitutive Model for Simulation of Cemented Soil

Classical soil constitutive models fail to describe the strain-softening response of cemented soil at a low stress level. This paper proposes a constitutive model that incorporates the Modified Cam Clay model to describe pressure-dependent soil stiffness and strength corresponding to volume changes into (1) empirical functions to recognize the mobilized friction and initial cementation as evolutions of the deviatoric plastic strain and (2) a power-type compressibility function to track the effective stress-dependent volumetric response. In this case, the no additional complexity related to the model formulation is added. The cement-treated constitutive model is implemented to simulate the drained triaxial test. The results indicate that the initial state of isotropic stress and the cement degradation rate defines the stress-strain-volume response, whereas the deviatoric stress eventually approaches the critical state strength.