爆炸荷载作用下围岩与地下结构的动力相互作用

利用ANSYS/LS-DYNA非线性显式动力有限元程序和流固耦合计算方法，对炸药在地下拱形结构上方岩石中垂直爆炸过程进行数值模拟，借助波动理论p-u Hugoniot线对爆炸冲击波在围岩与结构之间的传播和加卸载过程进行理论分析；得到了不同跨度拱形结构与围岩之间的最大相互作用力及相互作用力分布图。研究结果表明:冲击波由高阻抗围岩向低阻抗混凝土传播时，围岩卸载，应力减小；反向传播时，岩石加载，应力增大；爆距为5 m时爆炸冲击波对40 m跨度拱形结构整体产生拉压震荡，引起的震动效应显著。

Dynamic interaction between surrounding rock and underground structure subjected to blast loading

The nonlinear dynamic finite element procedure of ANSYS/LS-DYNA was used and the fluid-solid coupling algorithm was selected to numerically simulate the vertical explosion process of underground arch structures. And the wave theory of p-u Hugoniot curve was adopted to analyze the explosion wave communication process between arch structure and rock. The maximum interaction force and its distribution diagrams of different span arch structures were obtained. The results show that the surrounding rock is unloaded and the stress decreases when the wave is travelling from rock with high wave impedance to concrete with low wave impedance. And the surrounding rock is loaded and the stress increases on the contrary. The 40-m-span arch structure as a whole is shocked by tension and comression force when the explosion distance is 5 m and the explosion vibration is evident.