瓦斯治理常用公式(1)

孔流量与衰减系数关系钻孔流量衰减系数计算公式

孔经t日排放时的瓦斯流量，m3/min

孔成孔初始时的瓦斯流量，m3/min

—钻孔涌出瓦斯时间，d

——钻孔瓦斯流量衰减系数，d -1

初始抽采量

衰减系数抽采时间抽采量初始流量时间t的流量时间q0

βt qt q0qt t m3/min

d -1d m3/min m3/min m3/min d 0.141

0.048610.1343112530.050.0230.141

0.048620.1279398060.141

0.048630.1218706080.141

0.048640.1160893190.141

0.048650.1105822830.141

0.048660.105336490.141

0.048670.1003395460.141

0.048680.0955796460.141

0.048690.0910455460.141

0.0486100.0867265350.141

0.0486110.0826124080.141

0.0486120.0786934470.141

0.0486130.0749603940.141

0.0486140.0714044280.141

0.0486150.0680171510.141

0.0486160.0647905580.141

0.0486170.0617170290.141

0.0486180.0587893010.141

0.0486190.0560004590.141

0.0486200.0533439140.141

0.0486210.0508133890.141

0.0486220.0484029080.141

0.0486230.0461067740.141

0.0486240.0439195650.141

0.0486250.0418361120.141

0.0486260.0398514940.141

0.0486270.0379610220.141

0.0486280.036160230.141

0.0486290.0344448640.141

0.0486300.0328108710.141

0.0486310.0312543910.1410.0486940.001462811天时，达到初始流量的10-2，接近衰竭

排放时间的确定

Tj=3/β

Tj——排放时间的临界值，d

衰减系数衰减系数排放时间ββTj

m2/MPa2.d m2/MPa2.d d

0.3054302440.04869.822210011

0.195615.33742331

0.028107.1428571