首页|近距离薄煤层群首采层卸压瓦斯协同抽采技术研究

近距离薄煤层群首采层卸压瓦斯协同抽采技术研究

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为有效解决近距离薄煤层群开采首采层上、下邻近层大量卸压瓦斯涌入的治理问题,以某煤矿为研究对象,采用理论分析和数值模拟的方法,研究近距离薄煤层群开采条件下卸压瓦斯运移规律,并根据富集特征确定卸压瓦斯抽采钻孔的空间位置.研究结果表明:首采层开采覆岩导气裂隙带最大发育高为10.3~23.2 m.设计超大直径顺层预抽钻孔高0.8 m,宽2.08 m;顶板定向长钻孔终孔最优抽采位置为垂直距离开采层顶板15.0~23.0 m,水平距离回风侧20.5~27.5 m;2条埋管抽采最佳错距为距底板高1.1,1.7 m,深入采空区11.3,20.8 m.优化后的布置参数应用于现场实践,试验工作面回采期间上隅角瓦斯体积分数保持在0.7%以下.研究结果能够实现近距离薄煤层群开采条件下卸压瓦斯高效抽采,保证矿井安全高效生产.
Research on cooperative extraction technology for pressure-relief gas in first mining seam of short-distance thin coal seam group
In order to effectively solve the control problem of a large amount of pressure-relief gas influx to the upper and low-er adjacent seams in the first mining seam of the short-distance thin coal seam group,taking a coal mine as the research ob-ject,the theoretical analysis and numerical simulation methods were used to study the pressure-relieved gas migration law un-der the mining conditions of the short-distance thin coal seam group.The spatial positions of the pressure-relieved gas extrac-tion boreholes were determined based on the enrichment characteristics.The research results show that the maximum develop-ment height of the gas-conducting fracture zone in the overlying strata of the first mining seam is 10.3~23.2 m.The designed super-large diameter bedding pre-drainage borehole is 0.8 m in height and 2.08 m in width.The optimal extraction location of the roof directional long drilling final hole is 15.0~23.0 m vertically from the roof of mining layer and 20.5~27.5 m hori-zontally from the return air roadway.The optimal staggered distance of the buried-pipe extraction is 1.1 m and 1.7 m in height from the floor,and 11.3 m and 20.8 m deep into the goaf.The optimized layout parameters are applied to the field practice,and the gas volume fraction in the upper corner is kept below 0.7%during the mining period of the test working face.The research results can achieve the efficient gas extraction under the conditions of short-distance thin coal seam group,and ensure the safe and efficient production of mines.

short-distance thin coal seam groupfracture developmentcooperative extractionsuper-large diameter bedding boreholeroof directional long drillingburied-pipe extraction

倪廉钦、李忠备、高杰、付光胜、张晓玉、袁安营

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安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南 232001

伍伦贡大学土木采矿环境与建筑工程学院,新南威尔士伍伦贡2522

山西金晖万峰煤矿有限公司,山西孝义 032300

中国冶金地质总局青岛地质勘查院,山东青岛 266000

安徽理工大学经济与管理学院,安徽淮南 232001

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近距离薄煤层群 裂隙发育 协同抽采 超大直径顺层钻孔 顶板定向长钻孔 埋管抽采

煤炭安全精准开采国家地方联合工程研究中心(安徽理工大学)开放基金国家自然科学基金

EC202300752104073

2024

中国安全生产科学技术
中国安全生产科学研究院

中国安全生产科学技术

CSTPCD北大核心
影响因子:1.119
ISSN:1673-193X
年,卷(期):2024.20(4)
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