下分层含煤柱回采工作面“四位一体”防突体系应用及评价
Application and Evaluation of "Quaternity" Outburst Prevention System in Lower Working Face Containing Coal Pillar
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摘要: 针对曲堤煤矿下分层含煤柱回采工作面煤柱区应力集中、瓦斯含量高、突出危险强等特征，采用“四位一体”综合防突技术重点治理煤柱区。经过顺层长钻孔区域预抽，含煤柱回采面最大残余瓦斯含量仍处于煤柱区，但为5.11 m3/t，低于突出临界指标8 m3/t，工作面残余瓦斯含量沿煤层走向呈现“凸”字形分布，体现了巷道的卸压排采作用；采用钻屑瓦斯解吸指标△h2和S进行区域验证，△h2为60～80 Pa，S为1.6～1.8 kg/m，均低于突出危险临界值。含煤柱回采面开采过程中回风流瓦斯浓度仅有0.18%～0.31%，并且增收煤炭资源近8.5万t，节约成本432.1万元，“四位一体”防突体系保障了工作面高效安全开采。Abstract: For the characteristics of stress concentration, high gas content and strong gas outburst of coal pillar zone from lower working face in Qudi Mine, coal pillar zone is the key management area by using comprehensive outburst prevention technique of "quaternity". Through regional pre-drainage by using hole drilled along seam, the maximum residual gas content in coal seam was 5.11 m3/t, which is located in coal pillar from working face, it was less than 8 m3/t that was critical index of outburst, the residual gas content in coal seam showed "convex" form along the direction of face advancing, which reflected the function about pressure relief, drainage and extraction; regional verification used gas desorption index of drill cuttings △h2 and S, and △h2 was 60 Pa to 80 Pa, S was 1.6 kg/m to 1.8 kg/m, which were all less than critical index of outburst. The gas density in return air was only 0.18% to 0.31% during the mining of working face containing coal pillar, it recovered 85 thousand ton coal, and saved cost 4.321 million yuan, the"quaternity"ensures safety and efficiency of working face mining.
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