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- W4320895137 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 The increased traffic volumes in early infrastructures, which are characterized by outdated construction techniques and potential approximated realization, as well as rising groundwater levels due to variations in urban industrialization patterns, are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." @default.
- W4320895137 created "2023-02-16" @default.
- W4320895137 creator A5056018865 @default.
- W4320895137 creator A5058401814 @default.
- W4320895137 date "2023-03-17" @default.
- W4320895137 modified "2023-10-17" @default.
- W4320895137 title "Testing of a GPR equipment to assess the integrity condition of a subway tunnel located under groundwater level" @default.
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- W4320895137 doi "https://doi.org/10.1002/nsg.12249" @default.
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