瓦斯爆炸冲击作用下巷道壁面损伤破坏评估

Analysis Damage Assessment of Roadway Wall Caused by Gas Explosion Impact

摘要: 矿井瓦斯爆炸会导致巷道产生严重破坏，但是对于瓦斯爆炸冲击荷载对巷道壁面损伤破坏评估研究非常有限。针对现有研究的不足，本文分析了巷道壁面损伤破坏准则并选择了壁面损伤评估方法(支座转角损伤评估法)，采取基于支座转角的超压–冲量损伤破坏准则来分析瓦斯爆炸冲击荷载作用下巷道壁面的动态响应数值数据，拟合了瓦斯爆炸冲击荷载作用下巷道壁面P-I曲线，并将P-I空间划分了以支座转角2˚，4˚，6˚和8˚为节点为5个区域，这5个区分别为轻度损伤区、中度损伤区、重度损伤区、严重损伤区、坍塌破坏区。研究结果表明，本次建立的P-I曲线以及巷道壁面的损伤破坏等级能够反应巷道壁面的动响应情况和破坏特性，研究结果能为瓦斯爆炸巷道壁面损伤破坏评估提供参考。

Abstract: Mine gas explosions can cause severe damage to roadways, but the research on damage assessment of roadway walls by gas explosion impact loads is very limited. To address the shortcomings of existing studies, the damage criterion of roadway walls is analyzed and a wall damage assessment method (bearing angle damage assessment method) is selected. The overpressure-impulse damage criterion based on the bearing angle is adopted to analyze the numerical data of the dynamic response of the roadway wall under the impact load of gas explosion. The P-I curve of the roadway wall under the impact load of gas explosion is fitted. And the P-I space is divided into 5 regions with the nodes of bearing angles of 2˚, 4˚, 6˚ and 8˚. These 5 zones are mild damage zone, moderate damage zone, severe damage zone, serious damage zone, and collapse damage zone. The research results show that the P-I curve and the damage grade of the roadway wall can reflect the dynamic response and damage characteristics of the roadway wall. The results of the study can provide a reference for damage assessment of gas explosions in roadway wall.