The Transient Electromagnetic Response Characteristics of Unfavorable Geological Bodies in Tunnels

Lu Bo Meng; Tian Bin Li; Zheng Duan

doi:10.4028/www.scientific.net/AMR.261-263.1494

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 261-263The Transient Electromagnetic Response...

The Transient Electromagnetic Response Characteristics of Unfavorable Geological Bodies in Tunnels

Abstract:

A numerical model of Transient Electromagnetic Methods, which used to detect geological conditions in tunnels, was created by ANSYS finite element software, and the transient electromagnetic response characteristics of typical unfavorable geological bodies were discussed. The results indicate that the apparent resistivity isoline almost outputs in straight structure, and augments equably with the depth increasing when no unfavorable geological body is in front of the tunnel workface. The apparent resistivity isoline obviously reduces when water-rich karst cave, fault, or fracture exist in the front of the tunnel workface, where water-rich karst cave exists, the apparent resistivity isoline becomes close together, and there is to be an ordered pyramid resistivity-reduced area which can be an evidence of rich water fault. However, it will increase when dry fault or karst cave exist, and the high resistivity area corresponding to dry cave shows some triangles, but this phenomena is hard identified, which need detail analyses according to hydrogeologic data.

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Periodical:

Advanced Materials Research (Volumes 261-263)

Pages:

1494-1498

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.261-263.1494

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Online since:

May 2011

Authors:

Lu Bo Meng, Tian Bin Li, Zheng Duan

Keywords:

Numerical Simulation, Response Characteristic, TEM, Unfavorable Geological Conditions

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