【摘要】 为了找出爆炸动力作用下的力学规律、隧道围岩结构的薄弱部位和最容易失效的单元,通过建立土体隧道动力分析有限元整体模型,综合考虑非线性动力方程的求解方法、材料模型的选取、爆炸冲击波的输入方法和收敛性及流固耦合效应的实现因素,利用显式动力有限元程序ANSYS/LS-DYNA进行数值模拟,探讨了土体隧道围岩结构在爆炸作用下不同单元的时间历程曲线,分析了爆炸作用下土体隧道围岩结构的动力响应问题,从而为隧道的抗爆设防设计提供参考依据。更多还原

【Abstract】 It’s significant to obtain the mechanic laws and weak parts of soil tunnel,and the most likely failure elements under the explosion shock action to prevent terrorist attacks which can cause tremendous loss of human life and property and collapse and damage of many buildings and construction.Therefore,numerical simulation for soil tunnels is carried through the explicit dynamic finite element program ANSYS/LS-DYNA,and the time-history curves are discussed about the soil surrounding tunnel under explosion action.The dynamic response of soil tunnel under the explosion action is analyzed by establishing finite element integral model of soil tunnel dynamic analysis and comprehensively considering the solving method of nonlinear dynamic equation,the selection of different material models,the method of explosion shock wave input and the convergence and realizing factors of fluid-solid coupling effect.Thus,a reference for antiknock design of tunnels is presented.更多还原