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为了减少铁轨对瞬变电磁探测煤层底板的影响,采用物理实验模拟和井下试验相结合的方法,研究了铁轨影响下煤层底板的瞬变电磁响应特征,并总结出瞬变电磁响应规律。结果表明:受铁轨影响的瞬变电磁感应电位明显增大,感应电位衰减时间延长,含水异常区的视电阻率值明显低于未受铁轨影响时的视电阻率值。经校正得到的视电阻率断面图能准确反映煤层底板含水异常区的位置范围和赋水情况,提高了铁轨影响下瞬变电磁探测煤层底板含水异常区的准确性。
In order to reduce the influence of rail on the electromagnetic floor of coal seam, the transient electromagnetic response characteristics of coal floor under the influence of rail are studied by adopting a combination of physical experiment simulation and downhole test, and the law of transient electromagnetic response is summarized. The results show that the transient electromagnetic induction potentials induced by the tracks are obviously increased, the decay time of the induced potentials is prolonged, and the apparent resistivity values of the anomalous areas with water content are obviously lower than those without the influence of the tracks. The corrected apparent resistivity profile can accurately reflect the location range and water supply of the coalbed floor aquifer anomalous zone and improve the accuracy of the transient electromagnetic detection coal floor aquifer anomaly zone under the influence of the railway track.