岩体中空腔对爆炸振动的解耦效应

为分析岩体中空腔对爆炸振动的解耦效应，采用数值模拟方法，分析炸药耦合程度和岩体等级对岩体中空腔内爆炸振速解耦的影响规律。结果表明:岩体中振速随炸药耦合程度的降低而减小。数值模拟得到:I级岩体中空腔比例半径为1.0 m/kg^1/3时，岩体中各测点峰值振速与填实爆炸峰值振速之比的平均值为0.112；I级到IV级岩体对应的爆炸振速衰减指数逐渐增大，代表振速衰减变快；坚硬完整的岩体对爆炸振速的解耦效果较好，I级到IV级岩体对应的解耦系数中的指数分别为0.259、0.258、0.246、0.219。可为城市地下空间内偶然性爆炸效应分析和城市地下工程结构的隔振设计提供参考。

Numerical Simulation of Decoupling Effect of Cavity in Rock Mass on Explosion Vibration

In order to analyze the decoupling effect of the cavity in rock mass on explosion vibration, numerical simulation method was used to analyze the influence of explosive coupling degree and rock mass grade on the decoupling of explosion vibration velocity of cavity in rock mass. The results show that vibration velocity in rock mass decreases with the decrease of the coupling degree of the explosive. When the scaled radius of the cavity in Grade I rock mass is 1.0 m/kg^1/3, the average value of the ratio of cavity explosion velocity to filling explosion velocity is 0.112. Decay exponents of explosion vibration velocity corresponding to Grade I to Grade IV rock mass gradually increase, that is, the vibration velocity decays faster. The decoupling effect of the hard and complete rock mass on the explosion vibration velocity is better, and the exponents of the decoupling coefficients corresponding to the rock masses of Grades I to Grade IV are 0.259, 0.258, 0.246 and 0.219, respectively. It can provide a reference for the analysis of accidental explosion effects in urban underground space and the seismic isolation design of urban underground engineering structures.