隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例

孙怀凤, 李貅, 卢绪山, 李术才, 任宝宏. 隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例[J]. 地球物理学报, 2016, 59(12): 4720-4732, doi: 10.6038/cjg20161231
引用本文: 孙怀凤, 李貅, 卢绪山, 李术才, 任宝宏. 隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例[J]. 地球物理学报, 2016, 59(12): 4720-4732, doi: 10.6038/cjg20161231
SUN Huai-Feng, LI Xiu, LU Xu-Shan, LI Shu-Cai, REN Bao-Hong. Transient electromagnetic responses in tunnels with strong interferences and the correcting method: A TBM example[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(12): 4720-4732, doi: 10.6038/cjg20161231
Citation: SUN Huai-Feng, LI Xiu, LU Xu-Shan, LI Shu-Cai, REN Bao-Hong. Transient electromagnetic responses in tunnels with strong interferences and the correcting method: A TBM example[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(12): 4720-4732, doi: 10.6038/cjg20161231

隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例

详细信息
    作者简介:

    孙怀凤,男,1982年生,博士,讲师,主要从事瞬变电磁正反演方面的教学与科研工作.E-mail:sunhuaifeng@gmail.com

    通讯作者: 李貅,男,1958年生,博士,教授,主要从事瞬变电磁相关理论的教学与科研工作.E-mail:lixiu@chd.edu.cn
  • 中图分类号: P631

Transient electromagnetic responses in tunnels with strong interferences and the correcting method: A TBM example

More Information
  • 以隧道掘进机(Tunnel Boring Machine,TBM)为例模拟了隧道强干扰环境下,瞬变电磁超前探测的响应曲线,系统分析了异常体(以直立充水断层为例)与掌子面距离、围岩电阻率差异、TBM长度、异常体规模等条件下的曲线特征和影响规律,发现TBM干扰源表现为低电阻率目标特征,其影响主要集中在早期,对于电性差异较大或目标规模较大的低电阻率异常(充水断层)模型能够明显地通过衰减曲线区分.根据电磁场叠加原理,将隧道腔体中包含TBM模型的响应减去纯隧道腔体响应可以获得TBM的响应信号,以此作为干扰背景,从实际包含TBM和充水断层的隧道模型总响应中减除,获得去除TBM干扰的响应信号.通过8组算例进行对比,发现经过校正的衰减曲线与模型计算曲线吻合较好,视电阻率曲线差异相对较小,能够表现探测区域的电性分布情况,确认该方法在不同情况下的适用性.即使在TBM响应计算时给定背景电阻率与实际电阻率差异达到100%的情况下,依然能够通过校正获得合理的响应信号和视电阻率曲线.该方法不仅仅适用于隧道环境,对于其他诸如地面、航空、半航空、海洋瞬变电磁勘探同样适用.
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出版历程
收稿日期:  2015-06-29
修回日期:  2016-01-20
上线日期:  2016-12-05

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