摘要
为研究22116综采工作面周期来压对正常回采的影响,采用微震和支架在线监测系统对22116工作面进行现场实测,并结合理论分析对工作面周期来压步距及关键层进行了确定。结果表明:大同组23.0 m细粒砂岩为基本顶,其所控制的上覆岩层平均厚度70 m,下伏煤层以上岩层为直接顶;工作面推进速度越快,微震活动越强烈,动力扰动下"三铰拱"结构易失稳形成悬臂梁结构,且推进速度较快时周期来压步距较短;工作面推进速度不同,基本顶弯曲断裂的微震强烈程度不同,同时微震事件时域分布显示出明显的周期来压特点,与矿山压力监测结果一致。
In order to study the influence of cyclic pressure of fully mechanized mining face 22116 on normal stoping,microvibrograph and bracket on-line monitoring system have been used to carry out field measurement on fully mechanized coal face 22116,the cyclic pressure step and key strata on the working face have been determined through theoretical analysis.The results have shown that the 23.0 m fine-grained sandstone of Datong group is the basic roof,with the average thickness of overlying strata controlled by it 70 m,and the strata above underlying coal seam the direct roof.The faster the advancing speed of the working face,the stronger the microseismic activity.Under the dynamic disturbance,the“three-twisted arch”structure is easy to become a cantilever beam structure,and when the advancing speed is faster,the cyclic pressure step is shorter.The microseismic intensity of the bending fracture of the basic top varies with the advancing speed of the working face,and the time-domain distribution of microseismic events shows the obvious characteristics of periodic pressure,which is consistent with the monitoring results of mine pressure.
作者
李青锋
彭跃金
吴昊
崔栋歌
LI Qingfeng;PENG Yuejin;WU Hao;CUI Dongge(Institute of Mineral Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2020年第3期571-577,共7页
Journal of Mining & Safety Engineering
基金
湖南省自然科学基金项目(2018JJ2130)。
关键词
理论分析
来压步距
关键层
矿山压力监测
微震监测
theoretical analysis
pressure step
the key layer
mine pressure monitoring
microseismic monitoring
