近直立煤层地表垮冒与工作面微震活动关系  

Relationship between surface subsidence and microseismic activity of working face in steep-inclined coal seam

作　　者：冯攀飞 杨升 刘旭东 吴振华 FENG Panfei;YANG Sheng;LIU Xudong;WU Zhenhua(Shenhua Xinjiang Energy Ltd.,Urumchi 830027,China;State Key Laboratory of Geomechanics and Geotechanical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]神华新疆能源有限责任公司,新疆乌鲁木齐830027 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《西安科技大学学报》2022年第3期512-520,共9页Journal of Xi’an University of Science and Technology

基　　金：国家重点研发计划项目(2017YFC0804205);国家自然科学基金项目(51874231,51504184)。

摘　　要：为研究近直立煤层地表垮冒与井下围岩活动关系,采用理论分析、现场观测等方法,建立力学模型研究了煤层覆岩三铰拱结构跨长与拱高的关系,通过微震监测研究了地表垮冒滞后距离、围岩活动强度及工作面冲击危险规律,揭示了地表垮冒与工作面微震活动关系。结果表明:随着开采深度的增加,残留煤矸的高度不断增大易形成稳定的拱结构,导致顶板难垮;地面垮冒距离越大围岩活动强度越剧烈,围岩能量积聚与地表垮冒距离呈正相关性;地表垮冒滞后距离小于15 m时,微震监测数据相对平稳,工作面区域无明显应力集中现象,超过25 m时,微震事件能量较前期呈现明显上升。特殊区域结构条件下,地表滞后垮冒距离过大时,工作面出现明显应力集中现象、围岩活动具有不稳定性,工作面冲击危险性越大。To explore the surface catastrophic collapse in steep-inclined coal seam and activity relationship of shaft wall,a mechanical model was established by theoretical analysis and on-site observation to study the three hinged arch span length and structure of coal seam high arch.By microseismic monitoring the surface collapse delay distance,activity tense and the impact rule of surrounding rock,revealing the relationship between the surface and seismic activity of mining face catastrophic collapse.The results showed that:with the increase of mining depth,the height of residual coal gangue increases continuously,easier to form a stable arch structure,which makes the roof difficult to collapse;the larger the ground collapse distance is,the more intense the surrounding rock activity is,and the energy accumulation of the surrounding rock is positively correlated with the surface collapse distance;when the surface collapse lag distance is less than 15 m,the microseismic monitoring data is relatively stable,and there is no obvious stress concentration in the working face area;when more than 25 m,the energy of microseismic event increases obviously compared with the previous stage.Under the structural conditions of special area,when the surface lag and collapse distance is too large,the stress concentration turns out to be obvious in the working surface,the surrounding rock activity is unstable,and the impact risk of the working surface will be greater.

关 键 词：近直立 地表垮冒 围岩活动 冲击危险 

分 类 号：TD315[矿业工程—矿井建设]