In order to accurately grasp the characteristics and influencing factors of gas explosion in heading face, the mathematical model of gas explosion was determined. According to the actual size of a heading face of a coal mine, a 3D geometric model with a length of 100 m was established, and the effects of ignition energy and gas explosion equivalent on the gas explosion characteristics of the heading face were analyzed. The results show the following. (1) The mathematical models for numerical simulation of gas explosion can accurately simulate the gas explosion and its propagation process. The time-space step size has a great influence on the simulation results. The grid spacing for numerical simulation of mine gas explosion is determined to be 0.1 m and the time step length is determined to be 0.001 s. (2) The ignition energy has a limited effect on gas explosion characteristics. It only has a certain influence on the gas explosion process, but has little influence on the overpressure of shock wave. The larger the ignition energy is, the faster the explosion reaction speed is, and the maximum overpressure increases slightly. When the ignition energy increases to a certain value, the time of peak shock wave and the maximum overpressure both tend to be stable. The ignition energy has little effect on gas explosion characteristics when an explosion accident occurs underground with a large amount of gas accumulation. (3) The gas explosion equivalent has a great influence on the overpressure of gas explosion shock wave. The higher the explosion equivalent is, the greater the pressure is, and the peak value of the shock wave overpressure increases with the explosion equivalent as a power function. The research results have important guiding significance for the research and development of new technology for prevention and control of gas explosion.

中文翻译：

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掘进工作面瓦斯爆炸特征及其影响因素分析。

为了准确掌握掘进工作面瓦斯爆炸的特征及影响因素，确定了瓦斯爆炸的数学模型。根据煤矿掘进工作面的实际尺寸，建立了长度为100 m的3D几何模型，并分析了点火能量和瓦斯爆炸当量对掘进工作面瓦斯爆炸特性的影响。结果显示如下。（1）瓦斯爆炸数值模拟的数学模型可以准确地模拟瓦斯爆炸及其传播过程。时空步长对仿真结果影响很大。用于矿井瓦斯爆炸数值模拟的网格间距确定为0.1 m，时间步长确定为0.001 s。（2）点火能量对气体爆炸特性的影响有限。它仅对气体爆炸过程有一定影响，而对冲击波的超压影响很小。点火能量越大，爆炸反应速度越快，最大超压略有增加。当点火能量增加到一定值时，峰值冲击波的时间和最大超压都趋于稳定。当地下发生爆炸事故且气体蓄积量很大时，点火能量对气体爆炸特性的影响很小。（3）瓦斯爆炸当量对瓦斯爆炸冲击波的超压有很大影响。爆炸当量越高，压力越大，冲击波超压的峰值以爆炸当量为幂函数增加。研究结果对预防和控制瓦斯爆炸新技术的研究具有重要的指导意义。