爆破开挖扰动对深埋隧洞围岩损伤区的影响研究

Blasting excavation disturbance is an important influence factor to inoculation and evolution of buried tunnel damaged zone. Based on the theoretical analysis of influence mechanism on buried tunnel surrounding rock damage zone by blasting excavation, using numerical simulation method, the influences on buried tunnel damaged zone caused by blasting load, excavation transient unloading and surrounding rock stress redistribution have been studied. The results show that the surrounding rock damage zone is mainly caused by the initial stress redistribution and increased by blasting load, transient stress unloading will also increase the surrounding rock damage zone, and in-situ stress is higher, the damage cause by transient stress unloading is larger.