巷道前方地质异常八点电源电法随掘探测响应  

Response of Electrical Advanced Detection of Eight-point Sources-based Method while Excavating for the Geological Anomalies in front of the Tunnel

作　　者：史良伟 吴荣新[2] 缪长军 马克勤 SHI Liangwei;WU Rongxin;MIAO Changjun;MA Keqin(Zhangji Coal Mine,Huaihe Energy Group Corp.Huainan Minging Corp.,Huainan,Anhui 232001;School of earth and environment,Anhui University of Science and Technology,Huainan,Anhui 232001;Fuzhou Huahong Intelligent Technology Co.,Ltd.,Fuzhou,Fujian 350003)

机构地区：[1]淮河能源集团煤业公司张集矿,安徽淮南232001 [2]安徽理工大学地球与环境学院,安徽淮南232001 [3]福州华虹智能科技股份有限公司,福建福州350003

出　　处：《中国煤炭地质》2024年第9期61-68,共8页Coal Geology of China

基　　金：煤炭安全精准开采国家地方联合工程研究中心(安徽理工大学)开放基金项目(EC2022010)。

摘　　要：为可靠探查掘进巷道前方地质异常体情况,提出了八点电源随掘超前探测方法。从巷道迎头向后沿巷帮中线布置32道电极,电极间距5m。近工作面8个电极顺次做为点电源电极,采集整条测线单极-偶极装置视电阻率值。根据微分电测深探测原理,每个点电源所测得的视电阻率值可视为该点电测深结果,得到电测深曲线图和视电阻率成像图。巷道每掘进20m,将最后4个电极滚动布置到新测线前4个电极,再进行八点电源电测深数据采集,得到连续变化的电测深曲线和电测深成像结果。根据单极-偶极装置视电阻率响应公式计算了工作面超前方向地质异常球体的响应,研究结果表明:对同一地质异常球体,距离掘进工作面由远到近,电阻率响应越来越明显;低阻球体边缘到点电源距离不大于球体半径时,可以探查;高阻球体边缘到点电源距离不大于1/2球体半径时,可以探查;低阻球体的响应强于高阻球体。地质异常体半径越大,能够被探查出的超前距离越大。因此,超前0~50m范围地质异常探测精度高;超前50~100m范围地质异常探测可靠性低,适宜解释是否有较大范围的地质异常区。八点电源电法随掘超前探测能够可靠探测工作面前方地质异常的赋存情况,为工作面安全快速掘进提供地质保障。In order to reliably detect the geological anomalies in front of the excavation roadway,a eight-point source-based electrical advanced detection technology while excavating has been proposed.A 32-electrode observation system is arranged along the middle line of the side of the roadway from the head-on to the back,with adjacent electrode distance of 5m.The 8 electrodes near the working face are used as the point power electrodes sequentially,and apparent resistivity values of the monopole-dipole device of the entire measurement line are collected.According to the principle of the differential electric sounding,the apparent resistivity values measured by each point source can be regarded as the electrical sounding results,and the eight-point source electrical sounding curve and apparent resistivity imaging map can be obtained.For every 20m of tunnel excavation,the last 4 electrodes are rolled and arranged to the front 4 electrodes of the new survey line.Then,eight-point source electrical sounding data collection is carried out to obtain continuously changing electrical sounding curves and imaging results.According to the apparent resistivity response formula of the unipolar-dipole device,the response of the geological anomaly sphere in the leading direction of the working face is calculated,and the results show that for the same geological anomaly sphere,the resistivity response becomes more and more obvious from far to near from the excavation face.When the distance from the edge of the low-resistance sphere to the point source is not greater than the radius of the sphere,it can be explored;When the distance from the edge of the high-resistance sphere to the point source is not more than 1/2 of the radius of the sphere,it can be explored;The response of a low-resistivity sphere is stronger than that of a high-resistivity sphere.The larger the radius of the geological anomaly,the greater the advance distance that can be detected.Therefore,the detection accuracy of geological anomalies in the range of 0~50m ahead is

关 键 词：矿井巷道 电法超前探 地质异常 视电阻率 随掘探测 

分 类 号：P631.3[天文地球—地质矿产勘探]