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Volume 21, Issue 6
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

Abstract

Determining the condition of underground concrete tunnels is fundamental for ensuring continuity and safety of operations, as well as for deploying efficient maintenance plans. The increased traffic volumes in early infrastructures, which are characterized by outdated construction techniques and potential approximated realization, as well as rising groundwater levels due to variations in urban industrialization patterns, are among the main causes of current concerns regarding their performance. Such uncertainties and constraints push towards the use of non‐destructive techniques, rather than direct methods, to gather the required knowledge on the actual status of structures. This study presents the results of a ground penetrating radar (GPR) investigation carried out in a subway tunnel segment to characterize the thickness of its underlying concrete elements, namely the tunnel invert and the concrete filling, deemed necessary after relevant flooding events prompted the evaluation of its overall integrity condition. A preliminary step was performed to define the optimal frequency and polarimetric antenna configuration, given the resolution and penetration requirements and considering the high electromagnetic interference characterizing the site. The selected configuration was then assembled in a dedicated survey platform, and an entire 650 m long segment surveyed, producing a high resolution delineation of the concrete elements thickness. The accuracy of the estimation has been validated through nine core samples, demonstrating the reliability and consistency of the conceptualized GPR platform.

© 2023 European Association of Geoscientists & Engineers. © 2023 European Association of Geoscientists & Engineers.
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/content/journals/10.1002/nsg.12249
2023-12-01
2025-06-16

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/content/journals/10.1002/nsg.12249
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Testing of a GPR equipment to assess the integrity condition of a subway tunnel located under groundwater level
Near Surface Geophysics 21, 473 (2023); https://doi.org/10.1002/nsg.12249
/content/journals/10.1002/nsg.12249
/content/journals/10.1002/nsg.12249
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  • Article Type: Research Article
Keyword(s): engineering; GPR; GPR polarization; ground penetrating radar; infrastructure monitoring; near surface; non destructive; non‐destructive testing; tunnel

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