Abstract
In this study, the creep-damage behaviour of monzogranite is first investigated through triaxial creep tests under different confining pressures. Creep deformation and its rate in the whole creep process are compared and analysed on the basis of the experimental results. It is seen that the rate of creep strains is closely related to applied stress and can be described by an exponential function in terms of deviatoric stress. A discrete viscoplastic damage constitutive model is then formulated in the discrete thermodynamic framework and with micro-mechanical consideration. Comparisons between experimental data and numerical prediction show that the model can well describe the typical phenomena of creep behaviour.
Disclosure statement
No potential conflict of interest was reported by the authors.