Application of cross-hole radar tomograph in karst Area |
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| Authors: | Hanhua Tan Jiahui Huang and Shengwen Qi |
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| Institution: | (1) College of Civil Engineering, Chongqing University, Chongqing, 400045, China;(2) Guizhou Institute of Planning, Investigation and Designing of Communications Infrastructures, Guiyang, 550001, China;(3) China University of Mining and Technology, Xuzhou, 221008, China;(4) Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; |
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| Abstract: | Electromagnetic wave CT, containing velocity CT and attenuation CT, is one of the effective geophysical prospecting methods
to detect underground caves. The accuracy is low when applying the velocity CT and the attenuation CT separately into investigation
in a karst area. This paper briefs the basic theory of electromagnetic wave CT imaging, and then mainly introduces the basic
theory and applying methodology of cross-hole radar tomography for exploration in a karst area. Through numerical value simulation
and practice verification, the advantage and disadvantage of the velocity CT and the attenuation CT of electromagnetic wave
based on very high frequency have been studied, respectively. It has been found that the attenuation CT does better in confirming
the location of karst caves, and the velocity CT is better in determining the shape of the karst caves although the whole
distribution regular of the velocity CT is almost consistent with the attenuation CT. |
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