Study on Damage Behavior and Its Energy Distribution of Deep Granite at High-Temperature Conditions

The phenomenon of surrounding rock damage and rupture caused by high temperatures is widespread, has become a potential threat to the safety nuclear waste disposal repositories. In order reveal energy distribution pattern fractured granite during failure process under different confining pressures, triaxial compression tests were carried out on rocks with initial thermal damage. Firstly, was treated at temperature analyze change rule porosity after high-temperature treatment, define equivalent coefficient, influence pressure coefficient peak stress strain rock. results show that, increases increase in temperature. corresponding samples similar factors pressure. By comparing same damage, larger pressure, smaller difference specimens. Then, density test quantitatively analyzed theory. as long same, proportion dissipated specimen evolution trend strain. When decreases rapidly due factor, but rate decline will gradually slow down; however, when increases, factor decrease, because fracture bound Finally, we maximum deformation failure. According inflection point energy, optimum time for critical support key mass determined.