中文摘要：

提出了深部洞室围岩分区破裂化的冲击破坏机制。即在岩体开挖引起的围岩应力重分布过程中,径向应力波波前产生应力不连续间断面,当波前应力降满足一定条件时,产生局部冲击破坏。根据弹性动力学理论,应用位移势函数,通过Laplace变换简化计算,推导了洞室开挖瞬间围岩径向应力场的动力学理论解,得到了发生各次分区破裂化时,波前径向应力降的统一计算公式。根据质点速度、间断面压力降,由动量守恒定律推导了围岩分区破裂化的冲击本构方程和破坏准则,得到了产生冲击破坏的间断面压力降临界值计算公式。给出了分区破裂形成后各破裂区半径的表达式,关系式表明,各破裂区之间存在等比关系,其等比值为3。

英文摘要：

The shock failure mechanism of zonal disintegration within surrounding rock in deep chamber is put forward.The transient unloading in surrounding rock creates dynamic action on rock near cavern periphery.In the process of redistribution stress in surrounding rock,the discontinuity plane of the radial stress at wave front existed as the elastic longitudinal wave moves ahead.When the parameters of discontinuity plane satisfy certain condition,a local shock destruction occured.Based on the elastodynamics theory,the dynamic problem can be expressed by displacement potential function;and the general solution of motion equations can be obtained by using Laplace transform.The radial stress field in surrounding rock induced by excavation is obtained.The unified solution of differential pressure at wave front is deduced.The shock constitutive equation and failure criterion on zonal disintegration within rock mass are analyzed based on particle velocity,differential pressure at wave front and conservation of momentum.The crtical value of differential pressure at wave front is obtained as shock failure is generated;and the formula of radius of the fractured zones is got.It shows that there exist the equal ratio relations between the radii and the ratio of equality is.