Abstract: In order to prevent coal dynamic disasters effectively, the triaxial compression test at different temperatures was carried out by using the triaxial servo-controlled seepage equipment for thermal-hydro- mechanical coupling of coal containing methane. Based on the theory of statistical damage mechanics, the overall damage evolution equation of coal under temperature load was put forward, and the mathematical expression of energy in the process of deformation and failure of coal was deducd. The method to determine the failure point of coal under stress and temperature coupling condition was put forward by introducing the dissipation energy coefficient ω. The experimental results show that the stage characteristics of deformation and failure process of coal are basically similar at different temperatures, that corresponding to different deformation and failure stages, the energy evolution characteristics of coal show periodic changes, that the distribution of total energy is basically not affected by temperature in the process of deformation and failure, and evolution laws of elastic energy ratio and dissipated energy ratio at different temperatures have a great similarity, and that the energy dissipation is the main cause of the internal structure damage of coal, and the overall damage variable of coal increases in a power function with the constant dissipation of energy.

Key words: coal or rock damage, load, dissipated energy, pore-fracture, thermo-mechanical coupling