煤矿瓦斯爆炸冲击下的防爆墙受力数值模拟

Numerical simulation of explosion-proof wall stress under the impact of coal mine gas explosion

瓦斯爆炸作为严重的的煤矿安全生产事故之一,一旦发生会造成严重的人员伤亡,而防爆墙可以有效的抵抗瓦斯爆炸冲击。为此,本文采用数值手段研究了煤矿瓦斯爆炸冲击作用下防爆墙的防护性能。通过与已有研究对比验证了模型的正确性,系统探讨了弧度对防爆墙性能的影响,并对比了传统直墙与弧形防爆墙的差异。结果表明,相较于传统直墙,弧形防爆墙墙后压力更小,对爆炸冲击波的削弱效果更为显著。爆炸冲击响应时间以及爆炸造成的水平压力峰值与墙后测点水平距离呈正比,与压力衰减速度呈反比。相较于水平压力,竖向压力峰值更大,且各测点间的差异更为明显。60°圆心角工况的压力曲线中,峰值压力衰减明显,且整体墙后压力较小,因此,圆心角为60°的弧形防爆墙爆炸冲击波削减效果较佳。

As one of the serious coal mine safety production accidents,gas explosion will cause serious casualties once it occurs,and the explosion-proof wall can effectively resist the impact of gas explosion.Therefore,this paper studies the protective performance of the explosion-proof wall under the impact of coal mine gas explosion by numerical method.The correctness of the model is verified by comparing with the existing research.Then,the influence of radian on the performance of explosion-proof wall is systematically discussed,and the difference between traditional straight wall and arc-shaped explosion-proof wall is compared.The results show that compared with the traditional straight wall,the pressure behind the arc explosion-proof wall is smaller,and the weakening effect on the explosion shock wave is more significant.The response time of the explosion shock and the peak value of the horizontal pressure caused by the explosion are proportional to the horizontal distance of the measuring point behind the wall,and inversely proportional to the pressure decay rate.Compared with the horizontal pressure,the vertical pressure peak is larger,and the difference between the measuring points is more obvious.In the pressure curve of the 60°central angle condition,the peak pressure attenuation is obvious,and the pressure behind the whole wall is small.Therefore,the arc explosion-proof wall with a central angle of 60°has a better explosion shock wave reduction effect.