为解决沙曲矿瓦斯治理工程进展缓慢、矿井采掘接替紧张问题，本文开展了大孔径高位钻孔抽采瓦斯技术研究。裂隙带边界的准确确定，是高位钻孔合理布置的先决条件，将直接影响高位钻孔抽采瓦斯效果。采用基于关键层理论的判别方法，确定了裂隙带边界为煤层上方6．59～46．24m ，并通过数值模拟对理论分析结论进行了验证，两者一致。现场试验结果表明：大孔径高位钻孔抽采效果良好，高浓期时平均抽采浓度达37．3％，平均瓦斯抽采纯量达11．58m3/min；同时，解决了工作面回采期间瓦斯超限问题。%In order to resolve the problem of slow progress on gas control engineering and long period of excavation replacement ,this paper studied on gas drainage technology using large aperture high level borehole .The precondition of high level borehole layout within reason is acquisition with accuracy of fissured zone boundary ,which influences gas drainage effect directly .Fissured zone boundary located on the top of coal bed from 6 .59m to 46 .24m by using distinguishing method based on key stratum theory ,and then the conclusion was checked up by using numerical simulation .Field test results show that gas drainage using large aperture high level borehole achieves good effect ,average drainage concentration is 37 .3% and average drainage flow is 11 .58m3/min in the course of high consistency ,then the phenomenon of gas exceeding the limit usually occurs in working face is avoided .
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