›› 2009, Vol. 30 ›› Issue (9): 2810-2814.

• Numerical Analysis • Previous Articles     Next Articles

Research on forward simulation of tunnel lining cavity GPR images

ZHANG Hong-fei1, CHENG Xiao-jun1, 2, GAO Pan3, Zhou Xin-xin4   

  1. 1. Department of Surveying and Geoinformatics, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Advanced Engineering Survey of SBSM, Shanghai 200092, China; 3. China Railway Tunnel Group, Luoyang 471009, China; 4. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450002, China
  • Received:2009-04-07 Online:2009-09-10 Published:2010-03-24

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Abstract:

With the advantages of efficiency, advancement and non-destruction, ground penetrating radar (GPR) can scan the lining of tunnels successively and obtain objective and accurate images. Because of the transitory application of GPR in China and the complexity of radar images, there are still some problems in the identification of cavity radar images. Accordingly, through various tests the cavity feature is obtained; and GPR waves and images of tunnel lining cavity are simulated using 2D-FDTD. Finally, a forward numerical simulation program is developed with VC++, which simulates a few familiar cavity models in detection of tunnel lining. Comparing the simulated waves and images with the measured, and it is shown that the simulated, which has the cavity feature, is similar to the measured. The good results verify the feasibility of 2D-FDTD.

Key words: GPR, lining cavity, 2D-FDTD, forward model

CLC Number: 

  • U 45
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