空气中爆炸对巷道稳定性影响模拟研究

以西北某铀矿矿床某巷道为依托，针对巷道稳定性及巷道内爆炸问题，运用ANSYS软件对自重应力场下的巷道衬砌及围岩进行静力分析，得出巷道围岩有效应力分布情况及巷道断面上几个典型位置的位移量和等效应力值。在此基础上，再利用LS-DYNA显式分析功能模拟自重应力场下爆炸对计算，获得衬砌结构最大主应力和加速度时程曲线，分析爆炸波在巷道中传播规律，为巷道抗爆性设计提供参考。结果表明，巷道中的爆炸波会产生强烈的多次反射现象，并且在自重应力场下，直墙拐角处往往最先出现破坏。

Numerical simulation study on the effect of explosions in air to roadway stabilitity

According to the stability and the internal explosion of a roadway in an uranium deposit in northwest Chi- na, ANSYS implicit analysis was used firstly to the lining and the adjacent formation in the self-weight stress field, the distribution of effective stress in roadway surrounding rock and the displacements and equiralent stresses in typi- cal positions of roadway section were obtained. Then LS-DYNA explicit analysis function was applied to simulate the explosion in which gravity stress was considered. The time-history curves of the maximum principal stress and the acceleration from the simulation were studied to offer reference for the blast-resistant design of roadway. The re- suits showed that explosion wave in roadway will produce strong multiple reflections and the corners of roadway are often the first ones being damaged in the self-weight stress field.