隧道瞬变电磁超前探测去噪方法试验研究与应用

doi:10.13722/j.cnki.jrme.2017.0918

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摘要

隧道等地下工程在施工过程中常面临突水突泥等地质灾害，瞬变电磁法能够基于介质间的电阻率差异对掌子面前方的含水构造进行探测和定位。但由于隧道环境存在较多的干扰，实际探测获取的中晚期数据质量相对较差而无法使用。设计均匀半空间模型和三层经典模型研究瞬变电磁法探测的感应电动势转化成视电阻率的适用性，发现在无干扰时晚期数据转化效果良好，在强干扰情况下晚期数据转化效果较差。使用这2种模型，分别对比3种滤波算法改善晚期数据质量，改善瞬变电磁场强干扰环境下晚期衰减曲线的信噪比，提高瞬变电磁探测深度。现场试验发现，采用滤波算法与传统直接截断方法对比后，晚期数据可以使用，有效提高了探测深度，早期数据成像结果与直接截断方式成像结果相同，滤波算法不影响早期数据。

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关键词 ：隧道工程, 瞬变电磁, 超前探测, 滤波

Abstract：

The construction process of underground engineering like tunneling would face with the risks of complex geological disasters such as water inrush and mud outburst constantly，and transient electromagnetic method which is based on the difference of resistivity between surrounding rocks and water-bearing bodies could detect and position the water-bearing structure ahead of tunnel face. However，the data quality at middle-later period is relatively poor during the practical detection process. In this paper，the uniform half-space model and the three-layer classical model are studied to investigate the applicability of transient electromagnetism to detect apparent resistivity. The results show that the late-stage data conversion is good without interference and the late-stage data conversion is worse under strong interference difference. Compared with 3 filtering de-noising algorithms aiming to optimize the data quality at middle-later period，we are certain that they can improve the signal-to-noise ratio and apparent resistivity imaging of TEM induced electromotive force under strong interference circumstances. Using the filtering algorithm compared with the traditional direct truncation method after field testing，it is found the amendments to the unstable data which occurred in the late response period partial time-channels can improve the overall apparent resistivity imaging and the resolution of the detection results by the truncation method and filtering algorithms.

Key words： tunnelling engineering TEM advanced prediction filtering

引用本文:

张乐文1，2，宿传玺2，孙怀凤2，李召峰2，辛冬冬2，程铭2，吴启龙2，李凯2. 隧道瞬变电磁超前探测去噪方法试验研究与应用[J]. 岩石力学与工程学报, 2018, 37(S1): 3353-3361.
ZHANG Lewen1，2，SU Chuanxi2，SUN Huaifeng2，LI Zhaofeng2，XIN Dongdong2，. Experiment study and application of de-nosing method in transient electromagnetic prediction in tunneling. , 2018, 37(S1): 3353-3361.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0918 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3353

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