Gao Ke, Yang Zemiao, Yang Shuai, Li Shengnan
College of Safety Science and Engineering, Liaoning Technical University, Huludao 125000, China.
Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao 125000, China.
ACS Omega. 2023 Jan 30;8(6):5257-5273. doi: 10.1021/acsomega.2c05740. eCollection 2023 Feb 14.
Gas explosions are the biggest threat to coal mine safety, which often result in sudden massive destruction. When a gas explosion occurs in a mine, it often causes a large number of casualties and property losses, which significantly restricts the development of the coal industry. In this study, a numerical model was established for the excavation and main roadways under the condition of a forward blasting chamber and a blasting wall, and the law of overpressure propagation and the flame temperature were studied. The results show that the overpressure curve first increases and then decreases with time, exhibiting a fluctuating state, and finally tends to stabilize. The overpressure curve with an explosion venting chamber and explosion venting wall oscillates many times; compared with the roadway overpressure reduced by 10% and explosive impulse reduced by 8.5%, the explosion venting chamber and explosion venting wall have a certain explosion venting effect. The flame temperature exhibits a gradual increase in the early stage, a sharp increase in the temperature at the measuring point, a fluctuation in the temperature curve in the later stage, and a significant decrease after the roadway turns. The explosion venting chamber and explosion venting wall with different explosion venting pressures have a slight effect on the temperature of each measuring point in the roadway after a gas explosion.
瓦斯爆炸是煤矿安全的最大威胁，常常造成突然的大规模破坏。当矿井发生瓦斯爆炸时，往往会导致大量人员伤亡和财产损失，严重制约煤炭行业的发展。本研究针对正向爆破硐室和爆破墙条件下的巷道掘进与主要巷道建立了数值模型，研究了超压传播规律和火焰温度。结果表明，超压曲线随时间先增大后减小，呈波动状态，最终趋于稳定。有爆炸泄爆硐室和爆炸泄爆墙的超压曲线振荡多次；与巷道超压降低10%、爆炸冲量降低8.5%相比，爆炸泄爆硐室和爆炸泄爆墙具有一定的泄爆效果。火焰温度在前期呈逐渐上升趋势，测点温度急剧升高，后期温度曲线波动，巷道转弯后温度显著下降。不同泄爆压力的爆炸泄爆硐室和爆炸泄爆墙对瓦斯爆炸后巷道各测点温度影响较小。
