基于覆岩移动规律的大孔径扇形高位钻孔瓦斯抽采技术
Gas Drainage Technology of Large Diameter Fan and High Level Boreholes Based on Overburden Movement Law
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摘要: 以沙曲矿为研究背景，依据工作面覆岩采后垮落形成的采动椭抛带和“竖三带”理论建立模型，研究了大孔径高位钻孔瓦斯抽采技术。通过分析煤岩层中卸压瓦斯移动分布规律得知，将钻孔终孔布置在裂隙带上半部和椭抛带的重叠区域内可取得最佳抽放效果，并给出了钻孔仰角及方位角取值范围的计算公式。24207工作面的抽采数据表明，钻场平均抽采浓度在42%左右，平均抽采纯量高达11.6 m3/min。Abstract: Taking ShaQu Coal Mine as the research background, it built the model based on the theory of elliptical parabolic zone and "three vertical belts" which formed as working face overburden collapsed after mining, then it studied the gas drainage technology of large diameter high level boreholes. Through analyzing the movement and distribution law of pressure relief gas in coal seams, it showed that the best drainage effect was obtained by putting terminal borehole into the overlay area of upper half fracture zone and elliptical parabolic zone, and the calculation formula of the borehole elevation angle and the range of azimuth value were given. The extraction data of the No.24207 working face showed that, the average extraction concentration of drilling field was about 42%, and its average extraction pure quantity could reached 11.6 m3/min.
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[1] 张军颖,刘亚林. 5341综放工作面高位抽放巷治理瓦斯的探讨[J].矿业安全与环保,2010(8):118-119. [2] 刘智炜,李长宝,孙贵梁,等. 顶板走向高位钻孔瓦斯治理技术在五虎山煤矿的应用[J].矿业安全与环保,2011(8):73-75. [3] 李晓泉. 采空区高位钻场与高抽巷瓦斯抽放方法对比及实例分析[J].煤矿安全，2011(5):122-125. [4] 葛家理,宁正福,刘月田,等. 现代油藏渗流力学原理[M].北京:石油工业出版社,2001. [5] 郭良经,张建. 未卸压煤层有效瓦斯抽放半径的测定[J].煤矿安全,2011(9):95-97. [6] 李树刚,林海飞. 采动裂隙椭抛带分布特征的相似模拟实验分析[J].煤,2008(2):19-21. [7] 钱鸣高,缪协兴. 采场上覆岩层结构的形态与受力分析[J].岩石力学与工程学报,1995(6):97-106. [8] 梁运培,文光才. 顶板岩层“三带”划分的综合分析法[J].煤炭科学技术,2000(5):39-42. [9] 钱鸣高,许家林. 覆岩采动裂隙分布的“O”形圈特征研究[J].煤炭学报,1998(10):466-469. [10] 赵勇明,蒋曙光,邵昊,等.采空区瓦斯抽放钻孔终孔范围确定方法研究[J].煤炭科学技术，2011(5):51-53.
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