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为解决巷道迎头赋水性不确定的问题,基于瞬变电磁法在煤矿巷道掘进超前探测中的应用,测量了顺巷道方向和与巷道水平面呈45°夹角斜向上、下3个方向的地层赋水性,对赋水性进行了定性评价,分析了巷道迎头在视电阻率断面图上的响应特征。结果表明:巷道前方有两处视电阻率相对较低的区域,推断为地层反映,在此处掘进时可能发生淋水;巷道前方约70m处上方视电阻率较低,为异常区域,推断为软弱地层,巷道掘进至此处可能发生迎头顶板脱落。通过超前钻孔实际探测验证了瞬变电磁法对巷道前方的探测结果。
In order to solve the problem of uncertainty of headway watering, based on the application of transient electromagnetic method in advance detection of coal mine tunneling, the strata assigned to the upper and lower three directions were measured along the direction of the roadway and at the angle of 45 ° with the horizontal of the roadway Water-based, water-based qualitative evaluation of the roadway headway in the apparent resistivity profile of the response characteristics. The results show that there are two areas with relatively lower apparent resistivity in the front of the roadway, which are inferred to be formation reflection, where water may be drifted during tunneling. The apparent resistivity above the site about 70m in front of the roadway is low and is anomalous area, Weak strata, roadway heading to the roof may fall off here. The detection of the front of the roadway by the transient electromagnetic method was verified by the actual detection of the advance drilling.