厚煤层综放开采切顶留巷切缝参数优化研究  

Study on Optimization of Cutting Parameters of Roof Cutting and Retaining Roadway in Fully Mechanized Caving Mining of Thick Coal Seam

作　　者：王炯[1,2] 冯增超 程爽 陈鹏程 刘天赏 宋立志 WANG Jiong;FENG Zengchao;CHENG Shuang;CHEN Pengcheng;LIU Tianshang;SONG Lizhi(State Key Laboratory of Geomechanics and Deep Underground Engineering,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭技术》2023年第11期1-8,共8页Coal Technology

摘　　要：针对厚煤层综放开采切顶卸压沿空留巷切缝参数研究缺乏的问题,使用二维离散元软件UDEC进行模拟,采用控制变量法,通过分析不同切顶高度和切顶角度组合下的巷道顶板位移、实体煤侧应力集中程度,得出切顶高度17 m和切顶角度13°组合下的卸压效果最佳:采空区顶板垮落更充分,很好地弱化了开采动压对巷道的影响,使得巷道围岩应力和顶板竖向位移最小,巷道周边压力集中程度降低,提高了巷道整体的稳定性。研究成果为厚煤层综放开采切顶卸压沿空留巷技术的成功应用提供了基础。In view of the lack of research on the cutting parameters of gob-side entry retaining with roof cutting and pressure relief in fully mechanized caving mining of thick coal seam,the two-dimensional discrete element software UDEC is used to simulate,and the control variable method is used to analyze the displacement of roadway roof and the stress concentration degree of solid coal side under different combinations of roof cutting height and roof cutting angle.It is concluded that the pressure relief effect under the combination of roof cutting height of 17 m and roof cutting angle of 13°is the best:the roof of goaf collapses more fully,which weakens the influence of mining dynamic pressure on roadway,minimizes the stress of surrounding rock and vertical displacement of roof,reduces the pressure concentration degree around roadway,and improves the overall stability of roadway.The research results provide a basis for the successful application of roof cutting and pressure relief gob-side entry retaining technology in fully mechanized caving mining of thick coal seam.

关 键 词：厚煤层 切顶卸压 沿空留巷 顶板变形特征 应力变化规律 切缝参数优化 

分 类 号：TD823[矿业工程—煤矿开采]