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前言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
Preface Yangquan seven feet seam is anthracite, gas content larger. According to the coal seam gas pressure of 12 kg / cm ~ 2 measured by the three layers of rock tunnel roadway in the coal mine of Beitouzui Mine, the gas adsorption capacity test carried out on the coal sample is based on the measured gas pressure and the gas content is 24m3 / Ton. Seam pre-pumping