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| THE CALCULATION METHOD OF EQUIVALENT DIELECTRIC CONSTANT OF MULTI-LAYER UNDERGROUND MEDIA |
| XIAO Min, CHEN Chang-yan, SU Zhao-feng, JIA Hui, ZHANG Hui |
| BGI Engineering Consultants Ltd., Beijing 100038, China |
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Abstract Usually, city road consists of the surface layer and the subbase layer, and each layer contains several layers of different media with different relative dielectric constants. So using one relative dielectric constant to analyze the GPR data of all depths in city road detection is not accurate. This paper deduced the calculation formula of the equivalent dielectric constant of multi-layer underground media. Then the authors took two-layer media model and three-layer media model as examples to calculate the equivalent dielectric constant and the relation between the depth and the travel time. At last, theoretical modeling data of two-layer media were used to check the formula, and the results prove that the calculation formula of equivalent dielectric constant of multi-layer underground media is much better for practical GPR data analysis when there are multi-layer underground media.
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Received: 15 March 2012
Published: 10 April 2013
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