瓦斯爆炸起爆强度对巷道壁面冲击破坏的影响

Influence of Initiation Intensity of Gas Explosion on Impact Failure of Roadway Wall

矿井瓦斯爆炸会对巷道产生严重破坏,然而在分析巷道瓦斯爆炸热冲击破坏时,不同爆炸强度时的巷道壁面破坏特征分析较少。针对现有研究的不足,本研究利用LS-DYNA建立了巷道瓦斯爆炸物理数学模型,设置的爆炸能量分别为基本模型瓦斯爆炸能量的2,4,6,8,10,15,30倍,模拟了不同爆炸强度的瓦斯爆炸热冲击对瓦斯爆炸巷道壁面破坏特性的影响,并从超压变化、速度变化、位移变化和应力变化四个方面进行分析。研究结果表明:随着爆炸强度的增加,壁面超压增大,封闭端受到的超压载荷越强,封闭端壁面损伤破坏也越严重。随着瓦斯爆炸强度的增加,壁面测点最大位移不断增大。研究成果将为煤矿瓦斯爆炸灾害防治和瓦斯爆炸事故调查提供理论依据和技术指导,对丰富和完善瓦斯爆炸理论也将起到积极的促进作用。

Gas explosion in underground coal mine will cause serious damage to the roadway. However, when the thermal shock damage of gas explosion in roadway was analyzed, the results on damage characteristics of roadway wall under different explosion intensity are less. In view of the shortcomings of the existing research, LS-DYNA is used to establish the physical and mathematical model of gas explosion in roadway. The explosion energies are set as 2, 4, 6, 8, 10, 15 and 30 times of the gas explosion energy of the basic model. The influence of different explosion intensity on the wall failure characteristics of gas explosion in roadway is simulated. It is analyzed from four aspects: over-pressure change, velocity change, displacement change and stress change. The results show that with the increase of explosion intensity, the wall overpressure increases, and the stronger the overpressure load on the closed end, the more serious the wall damage of the closed end. With the increase of gas explosion intensity, the maximum displacement of wall measurement points increases continuously. The research results can provide theoretical basis and technical guidance for the prevention and control of gas explosion disasters and the investigation of gas explosion accidents in coal mine, and will also play a positive role in enriching and perfecting the theory of gas explosion.