The dynamic unloading effect of initial stress in hydrostatic field in excavation process of circlar tunnel by blasting under high geostress condition was studied and the damage field was caculated.

• 摘要分析了高地应力条件下静水压力场中圆形隧洞钻爆开挖时开挖边界上初始应力场动态卸荷效应及破坏机理，并计算了其破坏范围。