贵州煤矿区大、中型断层对瓦斯赋存的影响∗

摘要

为探明贵州煤矿区大、中型断层对瓦斯赋存的影响规律，研究了贵州典型矿井同一煤层埋深相近情况下大、中型断层对附近100 m 范围内瓦斯含量的影响情况。研究结果表明：距大、中型封闭性断层100 m 范围内，断层使瓦斯含量平均增加42％，距断层越近，断层落差越大，断层对瓦斯含量的影响越明显。开放性断层使瓦斯含量平均降低31％，多半断层可使瓦斯含量降低50％以上。复合断层对附近瓦斯含量的影响较为复杂，对同一钻孔不同煤层或受同一断层控制的不同钻孔的影响差别很大。%In order to get the influence rule of large and medium faults on gas occurrence in coal mines of Guizhou province,the influences of large and medium faults on their nearby gas content within the scope of 100 m in same coal seam and similar buried depth in typical mines of Guizhou province were studied. The results showed that gas content nearby large and medium closed faults within the scope of 100 m increased by an average of 42%,then the closer to the faults and the larger the fault throw was,the more obvious influences of faults on the gas con-tent. Open faults made the nearby gas content decrease by an average of 3 1%,and the gas con-tent mostly decreased by more than 50%. The influences of compound faults on the nearby gas content were very complex,the influences on the gas content of same borehole in different coal seams or different boreholes controlled by the same compound fault were very different.