关键词: 爆破开挖, 岩体损伤, 节理, 地应力, 引水隧洞

Abstract: The diversion tunnel of Yuwa Hydropower Station is excavated with drilling and blasting method, taking one typical excavation section as the research object, the damage evolution process of surrounding rock is simulated and analyzed based on LS-DYNA numerical software, especially the effect on blasting damage evolution property induced by joint surface and initial ground stress. The simulation results show that during blasting excavation process, the damage perpendicular to joint surface is weakened, while the damage parallel to joint surface is intensified. Initial ground stress contributes to weakening the development of blasting damage when the ground stress is low.

Key words: diversion tunnel, blasting excavation, rock damage, joint, ground stress