热固耦合条件下开挖损伤区的数值模拟

he creation of an excavation damaged zone (EDZ) is expected around all man-made openings in geologic formations. In underground engineering such as deep mining, nuclear waste disposal and geothermal exploiting, the formation and its subsequent spatial and temporal evolution of EDZ is considered as a coupled process among thermal, hydraulic and mechanical (THM) fields. A damage-based THM model is employed and numerically solved to study the evolution of EDZ under different in-situ stress (i.e., different lateral pressure coefficient) and temperature increment (no more than 100 K) conditions. The simulation results indicates that the damage zone is dominantly controlled by in-situ stess conditions. The thermal stress induced by temperature increment has a certain influence on the damage pattern, that it can promote the tensile damage, while restraint the shear damage.