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Forward Modelling and GPR Imaging in Leakage Detection and Grouting Evaluation in Tunnel Lining

  • Surveying and Geo-Spatial Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Tunnels in the operation period are faced with different types of diseases, such as lining fracture, lining containing voids and lining leakage. In this paper, the common tunnel lining diseases are classified and ground-penetrating radar (GPR) is adopted to detect the tunnel lining diseases rapidly and nondestructively. The finite-difference time-domain (FDTD) method is used to carry out numerical experiments on GPR detection forward modelling and backward projection imaging. An interpretation criterion of GPR detection was established on typical lining diseases. Based on the dielectric differences between before and after grouting of tunnel lining, GPR is introduced into the evaluation of grouting on leakage in tunnel lining, and the numerical simulation of grouting effect is carried out. It can be concluded that GPR imaging can well-identify the dielectric changes before and after grouting and evaluate the grouting reinforcement effect more intuitively. Finally, this method was applied to a practical case in Kaiyuan tunnel, China. This paper provides an alternative way to detect tunnel lining leakage in operation period and a reference for the evaluation of structural defects reinforcement in underground engineering.

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Acknowledgements

Much of the work presented in this paper was supported by the National Natural Science Foundation of China (Grant No: 51879153) and the China Postdoctoral Science Foundation (Grant No.: 2019M650789; 2019T120124).

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Correspondence to Zhenhao Xu.

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Lin, C., Wang, X., Li, Y. et al. Forward Modelling and GPR Imaging in Leakage Detection and Grouting Evaluation in Tunnel Lining. KSCE J Civ Eng 24, 278–294 (2020). https://doi.org/10.1007/s12205-020-1530-z

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  • DOI: https://doi.org/10.1007/s12205-020-1530-z

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