Transient electromagnetic S‐inversion in tunnel prediction
Transient electromagnetic S‐inversion in tunnel prediction
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DOI：
10.1029/2007gl031080
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发表时间：
2007-09
影响因子：
5.2
通讯作者：
G. Xue;Y. Yan;X. Li;Q. Di
中科院分区：
文献类型：
--
作者：
G. Xue;Y. Yan;X. Li;Q. Di
本文提出了隧道超前预报的S反演方法，用于隧道开挖过程中超前富水断层或裂隙带的预报。S-反演是一种基于移动薄片方法的使用电导率参数的二阶导数的瞬变电磁（TEM）数据的解释方法。针对传统上用于地面TEM资料解释的垂直视电导率二阶导数技术，提出了详细的理论分析和数值计算方法。最后，对一个真实的隧道进行了瞬变电磁法超前地质预报研究，结果表明，该方法对隧道施工中的不良地质探测和预报是有效的。
This paper presents S‐inversion method to tunnel prediction to forecasting water‐filled faults or fracture zones ahead of the front wall of a tunnel during tunnel excavation. S‐inversion is an interpretation method of transient electromagnetic (TEM) data using the second derivative of the conductivity parameter based on the moving thin sheet approach. It is suggested for the technology of second derivative of vertical apparent conductivity, which is traditionally used in surface TEM data interpretation, the theoretical analyses and the method of numerical calculation in detail are also given. Finally, a real tunnel forecasting is studied for TEM surveys, and results show that the proposed method is effective and successful for exploring and predicting unfavorable geology during tunnel construction.