基于围岩电性响应特征的钻孔雷达探测技术研究与应用  

Research and Application of Borehole Radar Detection Technology Based on Electrical Response Characteristics of Surrounding Rock

作　　者：胡洁 张义平[1,2,3] 郑禄林 兰红 HU Jie;ZHANG Yiping;ZHENG Lulin;LAN Hong(Mining College of Guizhou University,Guiyang,Guizhou 550025,China;Guizhou Yihe Technology Co.,Ltd.,Guiyang,Guizhou 550025,China;Guizhou Yihe Mining Co.,Ltd.,Guiyang,Guizhou 550025,China;Guizhou Wenjiaba Mining Co.,Ltd.,Bijie,Guizhou 552100,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州一和科技有限公司,贵州贵阳550025 [3]贵州一和矿业有限公司,贵州贵阳550025 [4]贵州文家坝矿业有限公司,贵州毕节市552100

出　　处：《矿业研究与开发》2025年第2期246-253,共8页Mining Research and Development

基　　金：国家自然科学基金地区基金项目(52474127,52164006);贵州省科技支撑计划项目(黔科合成果[2021]一般093,黔科合支撑[2022]一般248,黔科合支撑[2022]一般001)。

摘　　要：煤矿防突(涌)水关键在于厘清煤系地层-含水层之间的水力关系与精准探明异常区赋存情况,及时采取防治措施。以矿区地质特征与突水评价为基础,建立煤-岩-水耦合赋存下电性试验系统,探究介质在钻孔雷达外磁场下电激励响应特征与信号衰减特征。结果表明:工作面导水裂隙带高度为56.64 m,超过隔水层高度,工作面受长兴组含水层与采空区水威胁,突水危险性较高;LCR数字电桥试验中全频率段介电常数随频率增加而减小,100 MHz时介质电性特征、电容-介质损耗(C_(p)-D)特征峰值差异明显且信号传输稳定;钻孔雷达探测剖面在100 MHz时分辨率增高、成像稳定,低阻异常区主要为岩层分界处与长兴组灰岩含水异常区,且部分裂隙带、破碎带已出现导通含水情况。将研究成果纳入工程前期考量,从量化角度进一步解析物探成果,为同类工程地质探水工作提供一定实践参考。The key to prevent water outburst/gusher in coal mine is to clarify the hydraulic relationship between coal measure strata and aquifer,accurately detect the occurrence of abnormal areas,and take preventive measures in time.Based on the geological characteristics of the mining area and the evaluation of water inrush,the experimental system of coal-rock-water coupling occurrence was established to investigate the electric excitation response characteristics and signal attenuation characteristics of the medium under the magnetic field outside the borehole radar.The results show that the height of the water flowing fracture zone of the working face is 56.64 m,which exceeds the height of the water barrier.The working face is threatened by the water of the Changxing Formation aquifer and the goaf,and the risk of water inrush is high.In LCR digital bridge experiment,the dielectric constant of the medium decreases with the increase of frequency.At 100 MHz,the dielectric characteristics of the medium and the peak value of capacitance-dielectric loss(C_(p)-D)feature have obvious differences,and the signal transmission is stable.The resolution of borehole radar detection profile is increased at 100 MHz,and the imaging is stable.The low-resistivity anomaly area is mainly the boundary of rock strata and the water-bearing anomaly area of the Changxing Formation limestone,and some fracture zones have been found to contain water.The research results are brought into the pre-engineering consideration,and the results of geophysical exploration are further analyzed from the quantitative point of view,which provides some practical reference for similar geological water exploration work.

关 键 词：电性响应特征 介电常数 突水分析 钻孔雷达探测技术 

分 类 号：TD745[矿业工程—矿井通风与安全]