巷道壁面瓦斯爆炸破坏特征及防护数值模拟

Numerical Simulation of Gas Explosion Destruction Characteristics and Explosion Protection on Roadway Wall Surfaces

摘要: 针对矿井瓦斯爆炸导致巷道产生严重破坏的情况，本文建立了巷道瓦斯爆炸冲击破坏模型，并验证了该模型的可靠性。瓦斯爆炸对巷道壁面的破坏特征：巷道内瓦斯爆炸瞬间，封闭端壁面最先受到损伤，并且损伤位置为壁面中心位置，随着瓦斯爆炸冲击的持续作用，反应封闭端损伤破坏区域不断扩大，损伤破坏程度也不断加深。损伤破坏位置由封闭端向开口端发展，越靠近封闭端损伤破坏程度越严重些。安装泡沫防护材料后，巷道壁面超压测值较小，超压加载频率降低，壁面得到了较好的防护。同时，泡沫防护材料延缓了爆炸作用对壁面的冲击，冲击速度绝大部分都消耗在了防护壁面上。泡沫铝对瓦斯爆炸冲击载荷有较大的反射和衰减作用。研究结果能为瓦斯爆炸巷道壁面损伤破坏评估及防护提供参考。

Abstract: Arming at the severe destruction of roadway caused by mine gas explosions, the impact destruction model caused by gas explosion in roadway is established and the reliability is verified. Destructive characteristics of gas explosion on roadway walls are as follows: At the moment of a gas explosion in a roadway, the enclosed end wall is the first to suffer damage, and the damage occurs at the center of the wall. With the continuous impact of the gas explosion, the damaged and destroyed area at the sealed end continuously expands, and the degree of damage and destruction also continuously deepens. The damage and destruction progress from the closed end towards the open end. The closer it is to the closed end, the more severe the damage and destruction is. After installing foam protective materials, the measured overpressure values on the roadway wall are smaller, the frequency of overpressure loading decreases, and the wall is better protected. At the same time, the foam protective material delays the explosion impact on the wall, most of the impact velocity dissipates on the protective wall. Foam aluminum has a significant reflection and attenuation effect on the impact load of gas explosion. The research results can provide a reference for the assessment and protection of wall destruction in gas explosion in roadway.