覆岩采动卸压瓦斯高位钻孔抽采技术

发布时间：2018-03-23 04:08

本文选题：低透气性煤层　切入点：外错高抽巷　出处：《西安科技大学学报》2015年06期 　论文类型：期刊论文

【摘要】：为解决工作面隅角瓦斯超限难题,提出了在外错高抽巷内布置高位钻孔抽采工作面覆岩采动卸压瓦斯方法。针对李雅庄煤矿2-603工作面开采技术条件,建立了高位钻孔围岩结构力学模型,采用理论分析、数值模拟分析及现场实测分析等方法,确定了外错高抽巷内高位钻孔终孔合理位置。首先,覆岩采动裂隙主要分布在上山采动角62°以内,下山采动角65°以内,距离煤层底板13~25 m和38.6~50 m等2个区域,高位钻孔终孔应布置于第二区域内。其次,高位钻孔终孔位于2煤顶板44 m处,采空区内投影长度不小于28 m时,钻孔抽采瓦斯浓度高,且持续抽采时间长。最后,工程应用效果表明,2-603工作面上隅角瓦斯浓度生产班、检修班分别为0.50%~0.95%,0.47%~0.89%,避免了隅角瓦斯超限,保障了工作面安全高效回采。
[Abstract]:In order to solve the problem of gas over-limit in the corner of the coal face, the method of overburden gas relief in the mining face with high displacement and high drainage is put forward, aiming at the technical conditions of mining 2-603 face in Liyazhuang Coal Mine. The structural mechanics model of high hole surrounding rock is established, and the reasonable position of the end hole of high hole is determined by means of theoretical analysis, numerical simulation analysis and field measurement analysis. The mining fissure of overlying rock mainly distributes within 62 掳of mining angle of upper mountain, 65 掳of mining angle of downhill, 1325 m and 38.6 ~ 50 m from the floor of coal seam, and the final hole of high drilling hole should be arranged in the second area. The high hole is located at 44 m of the roof of No. 2 coal, and the projection length in the goaf is not less than 28 m, the gas concentration in the borehole is high and the time of continuous extraction is long. Finally, the application result of the project shows that the gas concentration production class in the upper corner of the working face is 2-603. The overhauling class is 0.500.95 and 0.470.89, which avoids the gas overrun in corner and ensures the safe and efficient mining of the working face.
【作者单位】：西安科技大学能源学院;教育部西部矿井开采及灾害防治重点实验室;
【基金】：国家重点基础研究计划(973计划)资助项目(2015CB251600) 国家自然科学青年基金项目(51304156)
【分类号】：TD712.6

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