煤与瓦斯突出冲击波及瓦斯气流所致伤害研究

为揭示煤与瓦斯突出过程中冲击波及瓦斯气流传播特性,针对这种突出做功随瓦斯压力、煤的普氏系数和煤的放散初速度变化的特征,运用气体动力学理论,建立冲击波超压、冲击瓦斯流速度与传播距离以及煤层瓦斯压力等参数的关系,计算不同超压下瓦斯气流传播伤害的范围。理论计算与现场测试结果表明,突出冲击波属惰性弱冲击波;波阵面上的超压传播伤害距离与突出时瓦斯膨胀的强度、巷道断面及巷道壁面的摩擦力和局部阻力等因素有关;冲击产生的高压瓦斯气流是造成巷道内大量人员窒息伤亡的主要诱因;突出能量瞬间释放没有补给,冲击波及瓦斯气流会在巷道阻力等因素作用下迅速衰减。

Research on Injuries Due to Shock Wave and Gas Flow from Coal and Gas Outburst

To reveal propagation characteristics of shock wave and gas flow from coal and gas outburst,relationship of shock wave overpressure with some parameters,such as propagation distance and coal seam gas pressure,was found.Relationship of impact gas flow velocity with the parameters was found too.The theoretical calculation and field test results show that outstanding shock wave is an inert weak shock wave,that propagation distance of damaging wave surface overpressure is related to factors,such as gas expansion intensity,roadway section and roadway wall friction,that the high pressure gas flow produced by the shock is the main cause of heavy casualties from suffocation in the roadway,that outburst energy is released instantly with no make-up,and that the shock wave and gas flow attenuate rapidly.