Modifications to an elasto-visco-plastic constitutive model for prediction of creep deformation of rock samples

The governing equations of the proposed model are implemented in numerical finite difference code (FLAC), using its built-in FISH language for constitutive models and then applied to a series of laboratory creep tests presented in the literature. The presented discussion compares the numerical results relating to the modified model with the data on time-dependent deformation developed in rock specimens.