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基于景福煤矿钻孔测定瓦斯参数实践,运用数值模拟、理论分析结合煤体应力分布特征和煤层内瓦斯运移规律对钻孔内瓦斯运移规律进行了分析,结果表明:钻孔周围煤体可划分为卸压增透区(距钻孔中心0.095 m)、增压减透区(距钻孔中心0.139 m)和原始渗透区;在钻孔自然排放瓦斯初期,增压减透区为瓦斯排放的瓶颈;在钻孔排放瓦斯过程中,煤体骨架收缩变形,有效抽采区域增大至增压减透区以外;计算得出景福煤矿可进行瓦斯抽采。
Based on the practice of measuring gas parameters by drilling in Jingfu coal mine, numerical simulation and theoretical analysis are used to analyze the gas migration in the borehole with the stress distribution characteristics of coal body and the gas migration in coal seam. The results show that: It can be divided into pressure relief enhancement zone (0.095 m away from the borehole center), pressurized relief zone (0.139 m away from the borehole center) and the original permeable zone. During the initial drilling natural gas drainage, the pressurized relief zone is gas During the process of drilling gas drainage, the coal skeleton shrinks and the effective drainage area increases beyond the pressure-intensifying and penetration-reducing zone. It can be calculated that Jingfu Coal Mine can carry out gas drainage.