论文部分内容阅读
阳泉七尺煤层为无烟煤,瓦斯含量较大。根据一矿北头咀矿井三下山岩石巷道穿层钻孔测得煤层瓦斯压力为12公斤/厘米~2,在煤样进行的瓦斯吸附容量试验按实测瓦斯压力计算,瓦斯含量为24米~3 /吨。煤层预抽瓦斯试验区的核定瓦斯含量为18.32米~3/吨。煤层钻孔百米长的自然瓦斯涌出量直径75毫米的为7.4升/分左右,直径300毫米的为16.8升/分左右。随时间变化的钻孔自然涌出规律直径300毫米的为 q=0.01995 e~(-0.022t);直径75毫米的为 q=0.00843e~(0.0188t)。
Yangquan seven feet seam is anthracite, gas content larger. The gas pressure of the coal seam is measured at 12 kg / cm ~ 2 according to the borehole drilling of three down-hill rock tunnels in a mine at Beitouzui Mine. The gas adsorption capacity test conducted on coal samples is calculated according to the measured gas pressure and the gas content is 24-3 /Ton. The gas content of the pre-drainage gas test area of the coal seam is 18.32m ~ 3 / t. Coal seam boreholes 100 meters long natural gas emission amount of 75 mm diameter of 7.4 liters / min or so, the diameter of 300 mm to 16.8 l / min or so. The natural gushing law of borehole with time changes is q = 0.01995 e ~ (-0.022t) for 300mm diameter and q = 0.00843e ~ (0.0188t) for diameter 75mm.