Analysis of Time-Domain Response Characteristics for Transient Electromagnetic in Tunnel Whole-Space

Abstract:

When it was leading prospecting in tunnel by TEM, the induced eddy current field would be produced on both side faces of a tunnel at the instant of disconnection of the excitation current. The receiver coil received the superposition of the eddy current field in the entire surrounding space, which was different from the superposition of eddy current field only with ground half-space. Using ANSYS computer program numerical simulated the propagation characteristic of transient electromagnetic fields in tunnel and compared the results on ground half-space with that in tunnel whole-space. The response curves were drawn by changing the depth of an abnormal body and the eigenfunction was obtained by fitting the curves. The results showed that the propagation in tunnel indicated “water wave effect” other than “smoking ring effect” on ground and the low conductivity body in tunnel changed the time-domain property of eddy current and displayed different curves.

• Periodical: Applied Mechanics and Materials (Volumes 90-93)
• Pages: 1888-1893
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.90-93.1888
• Online since: September 2011
• Authors: Zhan Rui Wu, Tai Yue Qi, Bin Li
• Keywords: ANSYS, Numerical Simulation, TEM, Tunnel Whole-Space

References

[1] Jens E D, Esben A and Flemming J: Journal of Applied Geophysics. Vol. 53 (2003), p.181

[2] Richard E M, Ward E S and Charles B C: Journal of Volcanology and Geothermal Research. Vol. 166 (2007), p.217

[3] Zhihai Jiang, Jianhua Yue and Shucai Liu: Journal of China University of Mining and Technology. Vol. 17 (2007), p.164 (In Chinese)

[4] L. A. Tabarovsky, M. M. Goldman and M. B. Rabinovich: Journal of Applied Geophysics. Vol. 35 (1996), p.261

[5] Michael L: Geophysics. Vol. 57 (1992), p.994

[6] Philip E W, Gerald W H and William A S: Geophysics. Vol. 49 (1984), p.60

[7] Xiaobo Li and Laust B P: Geophysics. Vol. 56 (1991), p.1462

[8] A. P. Raiche: Geophysics. Vol. 52 (1987), p.785

[9] J. H. Knight and A. P. Raichei: Geophysics. Vol. 47 (1982), p.47

[10] Tsili W and Alan C T: Geophysics. Vol. 61 (1996), p.110

[11] Tsili W and Gerald W h: Geophysics. Vol. 58 (1993), p.797

[12] Jopie I A, Gerald W H and Michael L O: Geophysics. Vol. 50 (1985), p.2849

[13] Stefi K and Michel C. Journal of Applied Geophysics. Vol. 50 (2002), p.375