高浓瓦斯井巷运移规律及致灾时空特征研究

Study of the migration rule of high-concentration gas and spatial-temporal feature of gas hazard in the tunnel

为了深入分析高浓瓦斯井巷运移规律及其致灾特征,建立了灾害气体一维运移扩散模型,并设计了相似模拟实验验证模型的可靠性,分析灾害气体运移规律,结合开采实际参数,计算了瓦斯致灾的时间与距离.结果表明:位置一定时,气体体积量与体积分数峰值、增速呈正线性相关关系;气体量一定时,距离与体积分数峰值呈负线性相关关系;通过巷道各断面气体总量近似相等;风速为2.1m/s,巷道断面为16m^2,涌出瓦斯量为10 000m^3时,在0~466s时间段内距涌出源400m之内巷道存在危险;瓦斯体积量与致灾距离、时间之间分别符合二次多项式形式,矿井最大安全瓦斯涌出量为809.4m^3.

To further analyze the migration rule of high-concentration gas and spatial-temporal feature of gas hazard, one-dimensional mathematical model was established, and the similar simulation experiment was designed to verify the model. Based on the similar simulation experi- ment, the migration rule was analyzed. Disaster characteristics were also analyzed based on the actual mining parameters and the mathematical model. The results show that volume fraction peak and increasing speed increase linearly with the gas volume in the same position. The vol- ume fraction peak decreases linearly with the increase of distance at a certain amount of gas. The total amount of gas passing through the section is approximately equal. When the wind speed is 2.1 m/s, and roadway section is 16 m2 , and gas emission is 10 000 ma , 400 meters from gas emission source within 0-466 seconds has a gas danger. Gas emission volume and hazard distance, hazard time, respectively, fit the quadratic polynomial. The maximum safe gas emission is 809.4 m3.