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炸药在地下受限空间爆炸时产生的冲击波由于受到周围介质的限制,会发生反射和叠加,其产生的爆炸冲击波流场远比自由场复杂。考虑直墙圆拱形坑道较圆形坑道其爆炸冲击波传播规律更为复杂,以某大断面直墙圆拱形坑道为研究对象,采用三维多物质任意拉格朗日欧拉(ALE)算法,对冲击波荷载的分布规律进行了数值模拟,对比分析了不同炸药高度和药包形状对爆炸流场的影响规律。结果表明:坑道壁面压力峰值衰减曲线受壁面位置、装药形状及炸高情况影响较大,尤其在近爆区与目前所用的经验公式差异较大,但随传播距离的增加,衰减曲线趋于一致,在进行结构抗爆设计时需区别对待。
Due to the limitation of the surrounding medium, the shock waves generated when explosives explode in underground confined space will be reflected and superimposed, and the blast shock wave field produced by them is far more complicated than the free field. Considering that the rule of explosive shockwave propagating in circular tunnel with circular arched tunnel is more complicated than that with circular tunnel, a large cross-section arched tunnel with straight wall is taken as the research object. A three-dimensional multi-material arbitrary Lagrangian Euler (ALE) The distribution of shock wave loads is numerically simulated. The influence of different explosives height and shape on the explosion flow field is analyzed. The results show that the peak pressure attenuation curve of tunnel surface is greatly affected by the wall position, charge shape and explosion condition, especially in the near-explosion area. However, with the propagation distance increasing, the attenuation curve tends to Consistent, in the structure of anti-blast design to be treated differently.