中文摘要：

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“逆流一回流”。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。

英文摘要：

coal and gas outburst is a complex dynamic phenomenon in coal mine and is one of the serious natural disasters which threaten mine safety production. Aiming at the ＂12.17＂ serious coal and gas outburst accident of Guaziyan coal mine in Hunan, and adopting TFIM （3D） numerical simulation technology, this study presented the simulation images of gas outburst with ＂ bidirectional outburst source＂ in coal face and the mutation process of mine disaster ventilation system. Simulation results showed that, the coal and gas outburst occurred in coal face or in roadway expanded outward with the outburst point as the center, in which reverse airflow occurred at the air intake side and overflowing phenomenon occurred at the return airflow side. Compared with the outburst happened in blind heading roadway, the impact intensity of the outburst gas decreased. After outburst dynamic disappears, under the actions of fan power and gas natural ventilation pressure, the ＂reverse airflow-regressive airflow＂ still exists in the roadway where the reverse airflow occurred. The simulation revealed that, in roadways with air doors and air regulators, phenomena of gas ＂current-limiting and stagnation＂ exist, in which the current-limiting effect could block the outburst gas from swarming into these roadways massively and oculd often offer a temporary shelter for the escaping staff, while the stagnation hindered the outburst gas to be discharged and is prone to trigger the secondary disaster of coal and gas outburst, namely, the gas explosion accident.