高速冲击载荷作用深埋巷道变形非线性数值模拟

Nonlinear numerical simulation of deep tunnel deformation under high-speed impact loading

深埋巷道冲击破坏问题一直是研究的难点,为更好的研究深部岩体动力破坏规律,揭示深埋巷道冲击破坏机制,采用非线性动力分析方法,利用FLAC3D计算软件再现深埋巷道冲击破坏过程,对高速冲击载荷作用下煤岩巷道变形规律进行非线性分析。计算结果表明,在高速冲击载荷作用下巷道顶底板和两帮围岩处有应力集中,均出现较大变形,且向巷道内部方向呈现出近似V型分布;各监测点作用力和位移结果也说明在巷道顶、底板和两帮围岩处均发生明显的冲击,且加载初期冲击较弱,在t=0.5s时冲击作用明显增强,计算结果可为深埋巷道加固措施提供有利参考。

The impact destruction of deep tunnel always a difficult issue.In order to research deep tunnel failure law better and reveal deep tunnol failure mechanism,using nonlinear dynamic analysis method,the law of deep tunnel de-formation under high-speed impact loading is analyzed by FLAC3D calculation software.The simulation results show that the roof and floor have stress concentration and a large deformation,and the direction of tunnel showing the inter-nal deformation distribution of similar V.The force and displacement monitoring results also show that the tunnel has an obvious impact,and the initial shock is weak,the impact load increased significantly at t = 0.5s.The results can provide a favorable reference for reinforcement the deep tunnel.