Liu Ao, Gao Ke, Li Runzhi, Tong Linquan, Liu Yujiao, Li Shengnan
College of Safety Science and Engineering, Liaoning Technical University, No. 188, Longwan South Street, Huludao, 125105, Liaoning, China.
Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China.
Sci Rep. 2024 Oct 26;14(1):25466. doi: 10.1038/s41598-024-76529-0.
Gas explosion is one of the five major hazards in mines, with about 36% of such incidents occurring in the excavation working face. Therefore, to investigate the impact of gas explosion propagation laws within excavation roadways, we conducted a simulation analysis of parameters such as peak of explosion overpressure, peak rate of pressure rise, and flame propagation speed in the presence of a Tunnel Boring Machine (TBM). In the presence of the TBM, the explosion overpressure approximately doubles, and the flame propagation speed also greatly increases, exacerbating the explosion hazard. Thus, when investigating gas explosion laws within excavation roadways, the presence of a TBM emerges as a significant factor that cannot be overlooked. Furthermore, an analysis of the effects of methane concentration and gas accumulation length on explosion parameters was conducted. The results indicate that when the flame passes through the TBM baffle, the average flame propagation speed increases the most when the methane concentration is 9.5%, increasing by about 6 times. In addition, as the gas accumulation length increases, both explosion overpressure and flame propagation speed gradually increase. Additionally, TBM has a certain impact on flame propagation and methane dissipation.
瓦斯爆炸是煤矿五大灾害之一，约36%的此类事故发生在掘进工作面。因此，为研究瓦斯爆炸在掘进巷道内的传播规律，我们对盾构机存在情况下的爆炸超压峰值、压力上升峰值速率和火焰传播速度等参数进行了模拟分析。在有盾构机的情况下，爆炸超压大约翻倍，火焰传播速度也大幅增加，加剧了爆炸危险。因此，在研究掘进巷道内瓦斯爆炸规律时，盾构机的存在成为一个不可忽视的重要因素。此外，还分析了甲烷浓度和瓦斯积聚长度对爆炸参数的影响。结果表明，当火焰穿过盾构机隔板时，甲烷浓度为9.5%时平均火焰传播速度增加最多，增加了约6倍。此外，随着瓦斯积聚长度的增加，爆炸超压和火焰传播速度均逐渐增大。另外，盾构机对火焰传播和甲烷消散有一定影响。
