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煤与瓦斯突出是煤矿中一种极其复杂的动力现象,是威胁煤矿安全生产的严重自然灾害之一。针对湖南挂子岩矿“12·17”重大煤与瓦斯突出事故,运用TF1M(3D)数值模拟仿真技术,给出了采煤工作面“双向突源”瓦斯突出及矿井灾变通风系统突变过程的仿真画面。模拟表明,发生在采煤工作面或巷道中的煤与瓦斯突出,是以突出点为中心向外膨胀冲击,进风侧逆流,回风侧过流,与独头突出相比泄流效应显著,冲击强度降低。突出动力消失后,在与通风机动力和瓦斯自然风压的共同作用下,逆流巷道依然存在“逆流-回流”。模拟得到,在风门风窗巷道出现瓦斯“限流和滞留”等现象,其中限流能阻滞突出瓦斯向这些巷道中大量涌入,对井下人员逃生提供暂时的庇护,而滞留则不利于突出后的瓦斯排放,容易引发煤与瓦斯突出的二次灾害——瓦斯爆炸事故。
Coal and gas outburst is an extremely complicated dynamic phenomenon in coal mines, and is one of the serious natural disasters that threaten coal mine safety in production. Aiming at the accident of “12.17” major coal and gas outburst in Huzeng rock mine in Hunan Province and the TF1M (3D) numerical simulation technique, the coal mining face, “two-way outburst” gas outburst and mine disaster ventilation System mutation process simulation screen. The simulation shows that the coal and gas outburst occurred in the coal mining face or roadway, which is caused by outward bulging impact on the protruding point, counterflow on the inlet side and overcurrent on the return air side, and the discharge effect is significant compared with the protrusion of the single head , The impact strength decreases. After the outstanding power disappears, under the joint action of fan power and natural gas pressure, the countercurrent roadway still exists “counter current - return ”. Simulation results show that the phenomenon of “current limiting and stagnation” of gas in the wind tunnel wind tunnel, in which the current limiting can block the influx of outburst gas to these tunnels and provide temporary shelter for underground personnel to escape, Which is favorable to the gas emission after the prominence and easily causes the secondary disasters of coal and gas outburst - the gas explosion accident.