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A metal interference correction method of tunnel transient electromagnetic advanced detection
Journal of Geophysics and Engineering ( IF 1.4 ) Pub Date : 2020-02-06 , DOI: 10.1093/jge/gxaa002
Guanqun Zhou 1, 2 , Mingxin Yue 1 , Xiaodong Yang 1 , Shengdong Liu 3 , Zhao Wu 2 , Yu Cao 2 , Xiaoping Wu 1
Affiliation  

Water inrush during tunnel excavation severally threatens the mining safety as blind water-bearing structures may develop in front of the working face. The transient electromagnetic method (TEM) has been widely applied in the advanced detection of tunnel water-bearing structures. However, the metal interference of both supports and tools in the tunnel has become a bottleneck that reduces the forecast accuracy of this method. In this paper, we analyse the effect of metal interference on TEM data and propose a novel set of an observation and correction method under metal interference based on the ratio of anomalous and background apparent resistivity. Flume model experiments both with and without metal interference are carried out, showing that this interference can affect TEMmeasurements significantly and result in false anomalies, and that our proposed method can remove this ambient noise caused by metal interference appropriately. The practical application further proves that this method can effectively reduce low-resistivity interference introduced by the support and other metal tools inside the tunnel. By applying this correction method, the location of water-rich anomalies can be detected more precisely during the excavation process of the same tunnel, which is of high application value of reducing exploration difficulty and tunneling risk.

中文翻译:

一种隧道暂态电磁超前探测金属干扰校正方法

隧道开挖过程中的突水,由于工作面前方可能形成盲水结构,对采矿安全构成威胁。瞬态电磁法(TEM)已广泛应用于隧道含水结构的先进检测。然而,隧道内支架和工具的金属干扰已成为降低该方法预测精度的瓶颈。在本文中,我们分析了金属干扰对 TEM 数据的影响,并提出了一套基于异常视电阻率与背景视电阻率之比的金属干扰下的观测和校正方法。进行了有和没有金属干扰的水槽模型实验,表明这种干扰会显着影响 TEM 测量并导致错误异常,并且我们提出的方法可以适当地去除这种由金属干扰引起的环境噪声。实际应用进一步证明,该方法可有效降低隧道内支架等金属工具引入的低阻干扰。采用这种修正方法,可以在同一隧道开挖过程中更准确地检测出富水异常的位置,对于降低勘探难度和掘进风险具有很高的应用价值。
更新日期:2020-02-06
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