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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。
The mechanism of the impact damage of the surrounding rock mass in deep caverns is proposed. That is, during the stress redistribution of surrounding rock caused by rock mass excavation, the stress wave discontinuity occurs in the wave front of the radial stress wave. When the wave front stress drop satisfies a certain condition, local impact damage occurs. According to the theory of elastic dynamics, by using the displacement potential function and the Laplace transform, the dynamic theoretical solution to the radial stress field of the surrounding rock during excavation is deduced. At the time of each subregion cracking, the wave front radial Unified formula of stress drop. According to the particle velocity and the pressure drop of the discontinuity, the impact constitutive equation and failure criterion of the rock mass zoning are derived from the law of conservation of momentum, and the critical pressure drop formula of the discontinuity is obtained. The expression of the radius of each rupture zone after the formation of the zone rupture is given. The relation shows that there is an equal relation between each rupture zone and the ratio is 3.