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Physical simulation and application of a new TEM configuration

Physical simulation and application of a new TEM configurati...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： G.Q.Xue X.Li·H.J.Quan s.jaggar N.N.Zhou Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences College of Geology Engineering and Geomatics Chang'an University

In some applications,especially for tunnel surveys and ancient tomb investigations,the scale of survey location is so small that it is impossible to lay a large enough transmitter loop for detection.A small-scale and high-power Transient Electromagnetic(TEM) transmitter configuration must be adapted to detect longer distance or greater *** the TEM surveying configuration may facilitate improving signal penetration and precision of TEM *** on physical simulation,a newly designed special-loop-source TEM survey configuration has been introduced,which employs four square apertures within a single large transmitter loop to excite stronger *** primary and secondary fields have been measured using both the new special-loop system and standard normal single loop TEM configuration for different receiver-transmitter separations and for different target *** response curves were compared, revealing that the primary field intensity and the secondary field response were improved by the special-loop transmitter system as compared to the standard *** new special-loop configuration can be used for tunnel TEM prediction and other TEM investigations.A case study was conducted on tunnel forecasting in Hubei Province,China. This terra TEM survey showed that it is an effective and successful method for exploring and predicting challenging geological structures ahead of a tunnel wall during excavation.

关键词： Transient electromagnetic Loop configuration small loop Model tests

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