Studying the mechanical response of rock under the influence of different thermal loads and applying mechanical load, using the damage mechanics method, is a relatively new research path in rock mechanics. In this research, thermal damage and mechanical damage have been investigated by performing uniaxial pressure test on crystalline limestone after exposure to different thermal loading. The overall rock damage evolution equation was deduced and the damage constituent equation under different thermal loading was determined based on macroscopic phenomenological damage mechanics and non-equilibrium statistical methods. The law of evolution of rock damage characteristics after exposure to different thermal loading was discussed, considering temperature and mechanical load as control variables. The results showed that the effect of different thermal loading on the mechanical properties of crystalline limestone can be eva‎luated through the definition of thermal damage using the elastic modulus. The results showed that the damage model curves in different thermal loading are similar to the experimental curves and show the brittleness of crystalline limestone well. Moreover, the constitutive relationships of the rock after exposure to different thermal loading using Weibull distribution showed close relationships with elastic modulus, compressive strength and maximum strain. The overall damage of rock changes during two evolutionary paths of high temperature and high strain, which reflects the mutual effects of different thermal loading and pressure on the damage propagation of materials, can accurately describe the mechanical behavior of damage and the law of damage propagation in rock materials after exposure. Reveal different thermal loading. The data used in this research is related to the PhD thesis of Mr. Bijan Dehghani.

لهراسب فرامرزي

محمد مشايخي

عليرضا باغبانان , حميد هاشم الحسيني