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| 深部开采顶板定向长钻孔“以孔代巷”高效瓦斯抽采技术研究 |
| Research on High-efficiency Gas Extraction Technology of Directional Long Drilling Holes in the Roof Plate of Deep Mining ‘Using Holes Instead of Lanes |
| 投稿时间：2024-06-03 修订日期：2024-06-13 |
| DOI： |
| 中文关键词: 深部开采 定向长钻孔 以孔代巷 高效抽采 |
| 英文关键词: deep coal seam directional long drilling of roof replacing alleys with holes high-efficiency extraction |
| 基金项目:安徽省教育厅重点基金2022AH050253；国家自然科学基金面上项目51974006 |
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| 中文摘要: |
| 深部煤层瓦斯压力和含量急剧上升，回采期间邻近层瓦斯大量涌出，极易导致瓦斯超限事故。传统高抽巷技术卸压瓦斯抽采效果好，但施工工期长，成本高，难以缓解突出矿井接续紧张的局面。为实现邻近层卸压瓦斯高效抽采，本文研究了顶板定向长钻孔“以孔代巷”瓦斯抽采技术的关键参数。基于数值模拟分析了顶板定向长钻孔不同高度、不同平距、不同间距下的瓦斯抽采效果，确定了最优布置参数，即底板垂距35m、回风巷平距离25m~110m、钻孔间距8m，并在淮南朱集东矿1131（3）工作面开展现场试验验证，回采期间工作面绝对瓦斯涌出量达53.91m3/min，顶板定向长钻孔瓦斯抽采纯量最大达43.54m3/min，平均为27.22m3/min，瓦斯抽采浓度最大达91%，平均为70.6%，平均抽采率为92%，瓦斯抽采效果显著，实现了以孔代巷目标。 |
| 英文摘要: |
| The gas pressure and content in deep coal seams increase sharply, and a large amount of gas gushes out from adjacent layers during mining, which can easily lead to gas exceeding limit accidents. The traditional high pressure gas extraction technology has a good effect on pressure relief gas extraction, but the construction period is long, the cost is high, and it is difficult to alleviate the situation of tight continuity in outburst mines. In order to achieve efficient gas extraction by unloading pressure in adjacent layers, this paper studies the key parameters of the directional long drilling "hole replacing roadway" gas extraction technology on the roof. Based on numerical simulation analysis, the gas extraction effect of directional long boreholes on the roof was analyzed under different heights, horizontal distances, and spacing. The optimal layout parameters were determined, including a vertical distance of 35m from the bottom plate, a horizontal distance of 25m-110m from the return air roadway, and a drilling distance of 8m. Field experiments were conducted at the 1131 (3) working face of Zhujidong Mine in Huainan, and the absolute gas emission during the mining period reached 53.91m3/min. The maximum pure gas extraction amount of directional long boreholes on the roof was 43.54m3/min, with an average of 27.22m3/min. The maximum gas extraction concentration was 91%, with an average of 70.6% and an average extraction rate of 92%. The gas extraction effect was significant, achieving the goal of replacing tunnels with holes. |
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