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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。
In order to reveal the characteristics of shock wave and gas flow in the process of coal and gas outburst, aiming at the characteristics of this outstanding work with gas pressure, coal’s Platts coefficient and coal’s initial velocity, using gas dynamics theory, The relationship between the velocity of the impact gas flow, the propagation distance and the gas pressure of the coal seam and the calculation of the range of the gas flow propagation damage under different overpressure. Theoretical calculation and field test results show that the prominent shock wave is an inert weak shock wave; the over-pressure propagation damage distance on the wave front is related to the intensity of gas expansion during the projection, the section of the tunnel and the friction and local resistance of the tunnel wall; Of the high-pressure gas flow is caused by a large number of people in the tunnel asphyxia casualties major causes; highlight the instantaneous release of energy without recharge, shock wave and gas flow in the roadway drag and other factors quickly decay.