隧道内爆炸冲击波传播特性及爆炸荷载分布规律研究

摘要

隧道内爆炸产生复杂的爆炸冲击波流场,作用于隧道衬砌上的冲击波荷载分析十分困难.采用三维有限元计算方法,对带端墙隧道内爆炸空气冲击波的传播过程进行了数值模拟,给出了内爆炸产生的隧道内冲击波流场,并与双向开口隧道内爆炸流场进行了对比,分析了炸药装药形状、炸药引爆位置对爆炸荷载分布的影响,研究了作用于隧道衬砌上的反射冲击波荷载峰值分布规律,给出了估计衬砌上反射超压峰值的公式.%Propagation of air shock wave induced by in-tunnel explosions and distribution law of shock wave load on inner surface of a tunnel were studied here.The flow fields of the shock wave in a tunnel with and without end walls were described on the basis of a three-dimensional finite element analysis.The distribution laws of the peak reflected overpressure (i.e.peak load) and the impulse on the inner surface of the tunnel were analyzed.The influences of shape and explosion location of TNT explosives on the propagation of the shock wave and the load were taken into account.The formula to evaluate the attenuation of the peak value of the reflected shock wave load on the inner surface of the tunnel versus the distance from the center of explosion was proposed.