综放工作面顶板及上覆煤柱水力预裂卸压技术研究
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摘要
针对白洞煤业煤体及顶板强度高,工作面顶板不易垮落,上覆煤柱出现应力集中,导致下部煤层开采时,产生回采巷道变形、工作面片帮、顶板破碎及冒顶等问题,采用水力预裂的方法,对工作面顶板及上覆煤柱进行预裂,防止工作面初采和回采过程中顶板大面积悬顶,并切断煤柱应力传递通道,缓减上覆煤柱应力集中,保证工作面安全回采。
Aiming at the problems such as deformation of mining roadway, face side wall, roof breakage and roof caving in the mining of lower coal seam which caused by high strength of coal body and roof, not easily collapse roof of the working face, and stress concentration of overlying pillars in Baidong Coal Industry, hydraulic presplitting method is adopted to ensure the safe mining of the working face, which can presplit the roof and the overlying pillars of the working face, prevent the roof from hanging over a large area during the initial mining and mining process, cut off the stress transmission channel of the pillars, and alleviate the stress concentration of the overburden pillars.
Aiming at the problems such as deformation of mining roadway, face side wall, roof breakage and roof caving in the mining of lower coal seam which caused by high strength of coal body and roof, not easily collapse roof of the working face, and stress concentration of overlying pillars in Baidong Coal Industry, hydraulic presplitting method is adopted to ensure the safe mining of the working face, which can presplit the roof and the overlying pillars of the working face, prevent the roof from hanging over a large area during the initial mining and mining process, cut off the stress transmission channel of the pillars, and alleviate the stress concentration of the overburden pillars.
引文
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[2]曾泰.极近距离中厚煤层下行开采可行性研究[J].中国煤炭,2018(6):70-73.
[3]魏永前,朱春伟.大倾角煤层下行开采工作面围岩应力分析及控制技术[J].能源与环保,2017(4):122-125.
[4]孟秀峰,赵洪亮.综放工作面水力压裂顶板控制技术研究[J].煤炭工程,2017,49(7):75-77.
[5]于斌,段宏飞.特厚煤层高强度综放开采水力压裂顶板控制技术研究[J].岩石力学与工程学报,2014,33(4):778-785.
[6]司浩浩.坚硬顶板水力压裂与深孔爆破初次放顶技术试验对比分析[J].煤炭与化工,2018(6):8-10.
[7]于红,王晓丽,张瑞林.松软煤层顶板水力压裂技术研究[J].中国煤炭,2017(12):137-141.
[8]赵学斌.综采工作面坚硬顶板水力压裂技术[J].煤,2014(3):36-39.