孔巷联合并行电法超前探测技术研究

Research on Advanced Detection Technology with Parallel Electrical Method on Hole-Roadway

巷道掘进是矿井生产的重要环节,也是矿井水害预防的最前沿阵地,有效的做到掘进迎头前方地质异常超前预测预报是实现巷道安全掘进的基础。考虑到巷道超前探测方法在各个方面的条件限制,结合矿井钻探与物探的优势,在钻孔和巷道内布设电极测量迎头前方区域地电场响应特征,同时开展孔巷联合并行电法超前探测的有限元三维数值模拟,采用金属球体模拟迎头前方典型低阻异常体,异常区域视电阻率值低于10Ω·m。该方法应用于五沟煤矿1024工作面风巷的实际探测,结果表明:超前探测区域内视电阻率值整体较高,孔底前方30~34m处存在一处明显低阻异常,其视电阻率值低于10Ω·m,后经实际揭露验证,该处较为湿润破碎。

Roadway excavation is an important part in mine production,and it is also the forefront of mine water damage prevention.Effective advance prediction of geological anomalies in front of heading face is the basis for realizing safe roadway excavation.Considering the limitations of the existing roadway advanced detection methods in various aspects,combined with the advantages of drilling and geophysical exploration,the electrodes are arranged inside the borehole and roadway at the same time to measure the response characteristics of the geoelectric field in the front area of the head.A finite element three-dimensional numerical simulation of combined parallel electrical advanced detection of holes-roadway was carried out.Using a metal sphere to simulate a typical lowresistance anomaly in front of the head,the apparent resistivity value of the anomaly area is lower than 10Ω·m.At the same time,the practical application was carried out in the air roadway of 1024 working face of Wugou Coal Mine.The results show that the apparent resistivity value in the advanced detection area is generally high,and there is an obvious low resistivity anomaly at 30~34m in front of the hole bottom.The apparent resistivity value is less than 10Ω·m,and it is verified by actual exposure that it is wet and broken.