摘要
煤岩界面的高精度探测是构建智能开采三维地质模型的关键难点。提出利用煤矿井下顺层孔实施单孔反射雷达,联合多孔探测结果构建区域煤岩界面地质模型实现透明工作面的方法。对单孔雷达数据,利用巷道波同相轴斜率计算煤层雷达波速度,采用空间约束偏移成像实现煤层顶/底板反射界面精准归位。形成3种匹配实际开采的透明工作面构建模式:回采前长钻孔模式、回采中短钻孔模式和联合模式。在山西某矿31004工作面对回采中短钻孔模式进行试验性应用,基于钻孔雷达构建的工作面地质模型与原始地质模型相比,局部信息刻画更精细,顶、底界面及煤厚与实际数据误差分别小于0.57、0.54、0.30 m。结果表明:钻孔雷达能高精度探测煤厚与顶、底界面,可实现透明工作面的构建。
The high-precision detection of coal rock interface is the key and difficult point to construct the three-dimensional geological model of intelligent mining.A method is proposed to construct regional coal rock interface geological model and realize transparent working face by using single hole reflection radar in the hole along coal seam and multi hole detection results.For single borehole radar data,the coal seam radar wave velocity is calculated by using the slope of roadway wave in-phase axis,and the spatial constrained migration imaging is used to realize the accurate calculating of coal seam top/floor reflection interface.Three transparent working face construction modes matching the actual mining are formed:the long boreholes mode before mining,the short boreholes mode during mining and the joint mode of two modes.The experimental application of the short boreholes mode in 31004 working face of a mine in Shanxi Province shows that the geological model of the working face based on borehole radar depicts more detailed local information than the geological model originally constructed by collecting other information.Compared with the actual measurement after mining,the maximum error of the coal seam top interface is 0.57 m;the maximum error of the coal seam bottom interface is 0.54 m;and the coal thickness error is 0.30 m.The results show that the borehole radar can detect the interface between coal seam and roof/floor with high precision,and the construction of transparent working face can be realized by combining multi boreholes.
作者
蒋必辞
程建远
李萍
刘文明
余俊辉
吴国庆
JIANG Bici;CHENG Jianyuan;LI Ping;LIU Wenming;YU Junhui;WU Guoqing(China Coal Research Institute,Beijing 100013,China;Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2022年第1期128-135,共8页
Coal Geology & Exploration
基金
国家重点研发计划课题(2018YFC0807804)
天地科技股份有限公司科技创新创业资金专项项目(2019-TD-ZD003,2020-TD-ZD003)。
关键词
钻孔雷达
透明工作面
顺层孔
煤岩界面
borehole radar
transparent working face
holes along seam
coal seam interface
