摘要
针对坚硬顶板下工作面初采阶段顶板难以自行垮落造成的采空区悬顶面积大、漏风严重以及悬顶突然大面积垮落带来的冲击力对设备和人员造成危害等问题,提出了初采深浅孔耦合三维定向水力致裂弱化顶板技术方案,通过理论分析、数值计算和现场观测等方法,对比工作面切眼未水力致裂及新工艺水力致裂初次来压数据,研究了初采深浅孔耦合三维定向水力致裂技术对厚煤层综放面坚硬顶板结构控制机理。结果表明,深浅孔耦合三维定向水力致裂使1012工作面基本顶初次来压步距从58m缩短为16.3m,大大改善了坚硬顶板工作面初采期间的安全生产条件。
Aiming at the large overhanging roof area, serious air leakage in the goaf and its harm to equipment and personnel caused by the impact of sudden large-area collapse of overhanging roof, as the roof often fails to cave on its own in initial mining of the working face under hard roof, we put forward a technical scheme of coupling three-dimensional directional hydraulic fracturing to weaken the roof at the initial mining with deep and shallow hole. Through theoretical analysis, numerical calculation and field observation, etc., the first weighting data of the working face open-off cut without hydraulic fracturing and with the new hydraulic fracturing process were compared, the control mechanism of the technology on the hard roof structure of thick coal seam longwall top-coal caving face was revealed. The results show that, with the proposed technology, the first weighting interval of the basic roof of the 1012 working face shortened from 58m to 16.3m, which greatly improved the safe production conditions during the initial mining under the hard roof.
作者
张京民
孟波
刘洪晨
ZHANG Jing-min;MENG Bo;LIU Hong-chen(Kuche City Kexing Coal Industry Co.,Ltd.,Kuche 842099,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭工程》
北大核心
2023年第1期53-58,共6页
Coal Engineering
基金
国家自然科学基金资助项目(51504247)。
关键词
坚硬顶板
深浅孔
水力致裂
初采期
hard roof
deep and shallow holes
hydraulic fracturing
initial mining period
