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为缩短常规封孔深度,延长钻孔有效使用寿命,实现煤矿井下瓦斯(甲烷)抽采高效密封,针对钻孔及周边煤体漏气问题,从巷道围岩变形角度探讨钻孔周边裂隙带漏气失效机制,提出并研究动态裂隙充填密封瓦斯抽采技术,并进行相关工程试验。结果表明,与常规的“两堵一注”封孔技术相比,采用动态裂隙充填技术的钻孔封孔深度缩短一半以上;在连续71天的抽采过程中,单孔平均抽采瓦斯体积分数提高了85%;钻孔平均累计抽采量和高效抽采时间均是“两堵一注”封孔的3倍以上;成本降低30%左右。
In order to shorten the conventional sealing depth, extend the effective service life of the borehole, and achieve efficient sealing of methane (methane) drainage in the coal mine, aiming at the problems of gas leakage in the borehole and the surrounding coal body, Gas failure mechanism, proposed and studied dynamic fissure filling and sealing gas drainage technology, and related engineering tests. The results show that compared with the conventional “two plugging” sealing technology, the depth of the sealing hole with dynamic fracture filling technology is shortened by more than half; in the continuous extraction of 71 days, the single hole average extraction Gas volume fraction increased 85%; average cumulative drilling extraction and efficient extraction time are “two plug a note ” sealing more than 3 times; cost reduction of about 30%.