近距离煤层群上保护层卸压瓦斯综合治理技术应用

Application of Comprehensive Control Technology for Pressure Relief Gas in Protective Seam on Short Distance Coal Seam Group

摘要: 针对筠连矿区近距离煤层群上保护层开采过程中邻近煤层瓦斯的运移与储集特征，上保护层开采对下邻近煤层群的卸压瓦斯治理。通过2106工作面作为上保护层，综合分析了上保护层回采期间的瓦斯来源，主要以本煤层瓦斯、回采阶段下邻近层3、7、8号煤层卸压瓦斯，并运用保护层开采技术，保护层工作面采取顺层瓦斯抽采钻孔预抽回采区域瓦斯，保护层卸压瓦斯通过底板瓦斯抽采巷穿层网格拦截瓦斯抽采钻孔预抽7、8号煤层瓦斯，3号煤层穿层拦截瓦斯抽采钻孔和顶板走向钻孔的综合瓦斯治理技术。实践证明，采取以上综合瓦斯治理技术后，杜绝工作面回采期间的瓦斯超限，为矿井的安全、高效开采提供了技术支撑。

Abstract: According to the characteristics of gas migration and accumulation in adjacent coal seams during the mining of Upper Protective Seams in Yunlian Coal Mine, the Upper Protective Seams Mining can control the pressure relief gas in adjacent coal seams. By using 2106 working face as upper protective layer, the gas source during the mining period of upper protective layer is analyzed comprehensively. The main gas is relieved from the adjacent layer 3, 7 and 8 coal seams in this coal seam, and the protective layer mining technology is applied. The protective seam working face adopts along-seam gas drainage borehole to pre-extract the gas in the mining area and the protective layer. Gas control mainly adopts the comprehensive gas control technology of pre-drainage area gas by boreholes along seam gas drainage in this coal seam, pre-drainage of pressure-relief gas in the lower adjacent seam through the floor drainage roadway cross-layer mesh interception and drainage boreholes in 7, 8# coal seam and 3# coal seam cross-layer interception and drainage boreholes and roof strike boreholes. Practice has proved that after adopting the above comprehensive gas control technology, the gas exceeding limit during the working face mining is prevented, and the technical support is provided for the safe and efficient mining of the mine.