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当采空区内部没有发生气体倒流现象时,煤层倾角增加,采空区渗流速度减小,采空区的漏风量也相应减少,采空区瓦斯总量随漏风量的减少而增加;当采空区内部发生气体倒流现象时,煤层倾角增加,采空区渗流速度增大,采空区的漏风量相应增加,采空区瓦斯总量随着采空区漏风量的增加而减少。
When the phenomenon of gas backflow does not occur inside the goaf, the coal seam inclination angle increases and the seepage velocity of the goaf decreases, and the amount of air leakage in the goaf decreases correspondingly. The amount of gas in the goaf increases with the decrease of the amount of air leakage. When the gas backflow occurs in the empty area, the dip angle of coal seam increases, the seepage velocity of the goaf increases, and the amount of air leakage in the goaf increases accordingly. The amount of gas in the goaf decreases with the increase of air leakage in the goaf.