土体隧道结构的爆炸动力反应分析

摘要

In this paper, by establishing model of soil tunnel dynamic analysis, and comprehensively considering the solving method of nonlinear dynamic equation and the selection of different material models, and considering the method of explosion shock wave input and the convergence and realizing factors of fluid-solid coupling effect, the numerical simulation for soil tunnels is carried through the explicit dynamic finite element program ANSYS/ LS-DYNA in this paper. Furthermore the time-history curves of displacement and stress are discussed about the soil surrounding tunnel under explosion action and the dynamic response of soil tunnel under the explosion action is also analyzed. Therefore , a reference for antiknock design of tunnel is presented.%本文通过建立土体隧道动力分析模型,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/LSDYNA进行数值模拟,探讨了土体隧道围岩和衬砌结构在爆炸作用下典型部位不同单元的位移和应力时间历程曲线,分析了爆炸作用下土体隧道围岩和衬砌结构的动力响应问题,从而为隧道的抗爆设防设计提供了参考依据.