摘要
基于矿井的地质条件和开采条件,构建井上下一体化微震监测台网,提出了一种井上下微震联合监测技术,对井上下联合微震监测结果在垂直方向的空间分布特征和数量特征进行了分析,并对微震事件分布规律与导水裂隙带发育高度的关系进行了研究。研究结果表明:微震事件在平面位置主要集中在工作面两端,且工作面回风巷侧应力集中程度明显高于运输巷侧,垂直方向上微震事件主要集中在煤层上方0~80m范围内,微震事件数量在顶板以上80m后急剧减少,得出导水裂隙带的最大发育高度在煤层上方80m左右范围内;其中,工作面煤层上方0~20m为垮落带,20~80m为采动裂隙带,微震监测结果与理论计算基本相一致。
Based on the geological conditions and mining conditions of the mine,an integrated underground microseismic monitoring network is constructed,and a surface and underground joint microseism monitoring technology is proposed. The quantitative and spatial distribution characteristics of microseismic events in vertical direction are analyzed. The relationship between the distribution of microseismic events caused by mining in working face and the development height of water flowing fractured zone is studied. The results show that: the microseismic events mainly concentrates at both ends of the working face in the plane position,the stress on the side of return air roadway in working face is obviously more concentrated than that on the side of transportation roadway. The microseismic events in the vertical direction mainly occurred within the 80 m above the coal seam,the number of microseismic events decreases sharply beyond 80 m above the roof,which indicates the maximum height of water flowing fractured zone is about 80 m. Above the working face,caving zone ranges within 20 m,and mining-induced fractured zone ranges from 20 m to 80 m. The theoretical calculation results are consistent with the microseismic monitoring results.
作者
王元杰
路洋波
WANG Yuan-jie;LU Yang-bo(Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Mining Institute,China Coal Research Institute,Beijing 100013,China)
出处
《煤炭工程》
北大核心
2020年第11期83-88,共6页
Coal Engineering
基金
天地科技股份有限公司科技创新创业资金专项项目(2019-TD-2-CXY006)。
关键词
井上下微震联合监测技术
微震事件
定位精度
导水裂隙带
surface and underground joint microseism monitoring
microseismic event
positioning accuracy
water flowing fractured zone
water control
