Zhang Xuebo, Wang Hao, Yang Ming, Han Linxiu, Wang Pan
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo 454003, Henan, China.
ACS Omega. 2022 Aug 24;7(35):31047-31058. doi: 10.1021/acsomega.2c03064. eCollection 2022 Sep 6.
Gas explosion is one of the main causes of casualties in coal mines. Studying the propagation law of shock wave of mine gas explosion can reduce the economic loss and personnel injury caused by mine gas explosion. To solve the difficulty in the research of shock wave propagation of gas explosion in the mine scale, the segmented relay simulation method of shock wave propagation of gas explosion in a coal mine was put forward, the related key problems were studied, and the results were successfully applied in Yangchangwan No. 2 Mine. The results show the following: (1) When the length of the forked roadway exceeds 50 m, the length of the forked roadway has little effect on the shock wave overpressure in the main roadway. When the length of the forked roadway is short, the closure of the forked roadway has a great influence on the change curve of the shock wave overpressure in the main roadway. Therefore, the length of the bifurcation roadway should not be less than 50 m in numerical simulation. (2) The angle of the bifurcated roadway has a great influence on the shock wave propagation of explosion in the main roadway. With the increase in the angle of the bifurcated roadway, the overpressure in the main roadway tends to increase at first and then decrease, and the peak overpressure is the highest when the angle of the bifurcated roadway is 90°. (3) The influence range of the roadway pressure-outlet boundary is about 5 m, and the dynamic parameter monitoring point should be set at about 10 m away from the pressure outlet; dynamic boundary monitoring parameters should include static pressure, dynamic pressure, and temperature. (4) When the gas explosion occurs in the heading face, the shock wave will cause great damage to the adjacent heading face. When the shock wave reaches the head-on and upper corner of the heading face, it will be reflected violently, which will cause the local overpressure to rise obviously. The peak overpressure and gas accumulation length conform to the logarithmic function.
瓦斯爆炸是煤矿伤亡的主要原因之一。研究矿井瓦斯爆炸冲击波的传播规律，可减少瓦斯爆炸造成的经济损失和人员伤亡。为解决矿井尺度瓦斯爆炸冲击波传播研究的难题，提出了煤矿瓦斯爆炸冲击波传播的分段接力模拟方法，研究了相关关键问题，并将成果成功应用于羊场湾二号煤矿。结果表明：(1)当分叉巷道长度超过50 m时，分叉巷道长度对主巷道冲击波超压影响较小。当分叉巷道长度较短时，分叉巷道封闭对主巷道冲击波超压变化曲线影响较大。因此，在数值模拟中分叉巷道长度不宜小于50 m。(2)分叉巷道角度对主巷道爆炸冲击波传播影响较大。随着分叉巷道角度增大，主巷道超压先增大后减小，分叉巷道角度为90°时超压峰值最高。(3)巷道卸压边界影响范围约为5 m，动态参数监测点应设置在距卸压口约10 m处；动态边界监测参数应包括静压、动压和温度。(4)当掘进工作面发生瓦斯爆炸时，冲击波会对相邻掘进工作面造成较大破坏。当冲击波到达掘进工作面迎头和上角时，会发生强烈反射，导致局部超压明显升高。超压峰值与瓦斯积聚长度符合对数函数关系。
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