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基于钻孔自然瓦斯流量衰减理论,结合在山西晋城阳城矿区3#煤层钻孔自然瓦斯流量的现场实测数据,统计了1～65 d内不同时间段内测定的钻孔自然瓦斯流量数据,然后通过回归分析的方式对比了不同时间内的钻孔自然瓦斯流量衰减系数,进而根据曲线衰减的拟合度探讨测定钻孔自然瓦斯流量衰减系数α的最短有效时间。结果表明:在钻孔自然瓦斯流量较大的无烟煤层,其衰减系数的合理测定时间应为40 d左右。
Based on the natural gas flux attenuation theory of boreholes, combined with the field measured data of natural gas flow in No.3 coal seam of Yangcheng mining area in Jincheng, Shanxi, the data of natural gas flow rate in boreholes measured in different time periods from 1 to 65 days were calculated. Through regression analysis, the natural gas flow attenuation coefficient of borehole in different time was compared, and then the shortest effective time for determining natural gas flow attenuation coefficient α of borehole was discussed according to the fitting degree of curve attenuation. The results show that the reasonable measuring time of the attenuation coefficient should be about 40 d in the anthracite seam with large natural gas flow in the borehole.