矿井瞬变电磁法在石墨矿中的应用

为了对石墨矿采空区及裂隙带富水性进行评价,开展了瞬变电磁法在矿井中的应用方式探究。结合矿井实际条件,将瞬变电磁技术应用到井下巷道内进行探测,采用多匝数和小回线(边长1 m左右)井下测量装置,对即将掘进的巷道迎头进行不同仰角全方位的数据测量;利用瞬变电磁视电阻率晚期公式计算不同方位的视电阻率,绘制同一仰角不同方位的扇形视电阻率剖面图,从而圈定前方的相对富水异常区。通过钻孔进行抽放水并验证,发现瞬变电磁法探测深度大约60 m左右,该方法可有效地预测巷道掘进迎头前方的含水异常,以及前方采空区的积水情况和裂隙发育区的含水情况,从而达到排查水害的目的。

Application of mine transient electromagnetic method in graphite mine

In order to evaluate the water abundance of the goaf and fracture zone in graphite mine,the application of the transient electromagnetic method in the mine was discussed.Combined with the actual conditions of the mine,the transient electromagnetic technology is applied to the detection of the underground roadway,and the measuring device with multi-turn and small loop(side length about 1m)is used to measure the data of different elevation angles of the roadway.The late formula of transient electromagnetic apparent resistivity is used to calculate the apparent resistivity of different azimuths,and the fan-shaped apparent resistivity profile of different elevations at the same elevation angle is drawn,so as to delineate the relatively water rich abnormal area in front.Through the verification of drilling and drainage,it is found that the detection depth of transient electromagnetic is about 60 m.This method can effectively predict the abnormal water content in the front of the tunneling face,the water accumulation in the goaf and the water content in the fracture development area,so as to achieve the purpose of water hazard investigation.