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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.
In order to deeply analyze the law of migration of high-pressure gas tunnel and its disaster characteristics, a one-dimensional model of migration and diffusion of disastrous gas was established and the reliability of the model was verified by simulating experiment. The law of gas migration was analyzed, The time and distance of gas disaster were calculated.The results showed that when the gas concentration is constant, the volume of gas has a positive linear correlation with the peak value of volume fraction and the growth rate of gas, and the negative correlation between the distance and the peak value of volume fraction at certain gas amount; The total amount of gas passing through each section of the roadway is approximately the same; the wind speed is 2.1m / s, the roadway section is 16m ~ 2 and the gushing gas volume is 10 000m ~ 3, within 400m from the source within 0 ~ 466s, There is danger; the volume of gas and the disaster distance and time are respectively in accordance with quadratic polynomial form, and the maximal safe gas emission of mine is 809.4m ~ 3.