Considering the coal and gas outburst phenomenon in the mining space, this paper analyzes the main characteristics of coal and gas outburst accidents, defines the outburst airflow reversal degree, and constructs a simplified topology graph of tunneling ventilation system, while the air door is not destroyed. Using the numerical simulation method, this paper elaborates on the relationship between the outburst pressure and airflow reversal degree. The results indicate that the inlet pressure increases to 264 hPa and the outlet pressure increases to 289 hPa when the outburst pressure increases from 1 hPa to 1 MPa, and the relative variation coefficient of pressure decreases from 1501.5 to 1.62 in the inlet of return airway and decreases from 2002 to 1.65 in the outlet of return airway. Furthermore, the air velocity decreases from −1.38 to −284.44 m/s in the inlet and increases from 3.10 to 297.38 m/s in the outlet. Moreover, the gas concentration of the inlet and outlet in return airway increases rapidly with the increase of outburst pressure. When the outburst pressure is greater than 0.15 MPa, the gas concentration will be over 98% in tunneling ventilation system. This paper also finds out a cubic polynomial relationship existing between the reversal degree and the outburst pressure. It provides the prediction of coal and gas outburst and serves as a guidance in case mine ventilation disturbances occur.

中文翻译：

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隧道巷道煤与瓦斯突出后通风系统气流逆转规律

考虑到矿区煤与瓦斯突出现象，分析了煤与瓦斯突出事故的主要特征，定义了突出气流逆转度，构建了隧道通风系统的简化拓扑图，同时风门不被破坏。 . 本文采用数值模拟方法，详细阐述了突出压力与气流逆转度之间的关系。结果表明，当爆发压力从1 hPa增加到1 MPa时，入口压力增加到264 hPa，出口压力增加到289 hPa，回气道入口压力相对变异系数从1501.5减小到1.62，回气道出口从 2002 年下降到 1.65。此外，空气速度从-1.38 降低到-284。入口处为 44 m/s，出口处从 3.10 增加到 297.38 m/s。而且，随着爆发压力的增加，回气道入口和出口的气体浓度迅速增加。当突出压力大于0.15 MPa时，隧道通风系统中的瓦斯浓度将超过98%。本文还发现了反转程度与突出压力之间存在三次多项式关系。它提供煤和瓦斯突出的预测，并在发生矿井通风干扰时提供指导。隧道通风系统中气体浓度将达到98%以上。本文还发现了反转程度与突出压力之间存在三次多项式关系。它提供煤和瓦斯突出的预测，并在发生矿井通风干扰时提供指导。隧道通风系统中气体浓度将达到98%以上。本文还发现了反转程度与突出压力之间存在三次多项式关系。它提供煤和瓦斯突出的预测，并在发生矿井通风干扰时提供指导。