典型山地压覆煤层冲击地压与瓦斯协同防治技术研究  

Coordinated control of rock burst and gas hazard in a coal seam under mountain

作　　者：刘淑红 侯建军 李美晨 杨治国[3] LIU Shuhong;HOU Jianjun;LI Meichen;YANG Zhiguo(Xinzheng Coal Power Co.,Ltd.,Zhengzhou450007,China;School of Mine Safety,North China University of Science and Technology,Beijing 101601,China;Zhengzhou Coal Industry(Group)Co.,LTD.,Zhengzhou 450000,China)

机构地区：[1]新郑煤电有限责任公司,河南郑州450007 [2]华北科技学院矿山安全学院,北京101601 [3]郑州煤炭工业(集团)有限责任公司,河南郑州450000

出　　处：《煤炭工程》2023年第9期60-66,共7页Coal Engineering

摘　　要：山地对其下部煤层冲击地压具有主导作用、对瓦斯赋存规律具有控制作用。典型山地压覆控制型冲击地压、瓦斯富集属于宽沟煤矿特有的冲击地压、瓦斯富集类型,其显现特征与地层结构具有密切的关联性。针对此类型,通过现场监测数据分析,采用Winkler弹性地基梁和渗流理论,探讨了山地对煤层埋深、应力、渗透率影响机制,分析研究了典型山地压覆煤层冲击地压与瓦斯赋存规律及其瓦斯涌出的相关性。研究结果表明:煤层受力特征、渗透率变化规律与埋深、地表标高变化表现出强相关关系;山地垂直压力作用下,煤层应力分布、渗透率分布表现出显著非线性特征,山峰正下方应力最大,渗透率最小;渗透率、煤层应力协同控制着煤层冲击、初始瓦斯含量值;协同防治技术应用效果显著,在工作面回采期间,无瓦斯异常涌出现象,上隅角瓦斯浓度低于0.50%,回风流瓦斯浓度低于0.22%。此外,工作面未发生106J级别以上的大能量微震事件,有效地解决了煤层冲击地压和瓦斯涌出异常的问题,确保了工作面的安全回采。The mountain plays a leading role in rock burst of the lower coal seam and has a controlling role in gas occurrence.Typical rock burst and gas accumulation under mountain is a unique hazard type in Kuangou Coal Mine,and its characteristics are closely related to the formation structure.In view of this hazard type,the field monitoring data were analyzed using the Winkler elastic foundation beam and seepage theory,to discuss the influence mechanism of mountain on the buried depth,stress and permeability of coal seam,and study the correlation between the rock burst and gas occurrence and gas emission under such condition.The results show that:the stress characteristics and permeability of coal seam are closely correlated with the variation of buried depth and surface elevation;under the vertical pressure of mountain,the stress and permeability distribution of coal seam is significantly nonlinear,and the stress is the largest and the permeability is the smallest right below the mountain peak;permeability and coal seam stress jointly control the rock burst and initial gas content.Aiming at the above results a collaborative technology was applied,and the effect was significant.During the working face mining,there was no abnormal gas emission,and the gas concentration in the upper corner was within 0.50%,and the gas concentration in the return flow was within 0.22%.In addition,there was no large energy microseismic event above the sixth power level in the working face,which effectively solved the problems of rock burst and abnormal gas emission in the coal seam,and ensured the safe mining of the working face.

关 键 词：山地压覆煤层 冲击地压 瓦斯治理 煤层应力 渗透率 

分 类 号：TD712[矿业工程—矿井通风与安全]