Journal
JOURNAL OF ENVIRONMENTAL AND ENGINEERING GEOPHYSICS
Volume 17, Issue 3, Pages 159-169Publisher
ENVIRONMENTAL ENGINEERING GEOPHYSICAL SOC
DOI: 10.2113/JEEG17.3.159
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Erosional voids developing around concrete-lined tunnels can compromise the safety of the surrounding areas, as well as of the tunnels themselves. In this study, ground penetrating radar (GPR) was used to assess the condition of a water tunnel built to channel a river under a mountain road. The tunnel is lined with 60-80 cm thick concrete and has a semicircular cross-section with a diameter that varies between 3 m and 4 m. The concrete structure has been damaged from erosion beneath the concrete floor, creating a sequence of pools and waterfalls, which further extend the erosive action below the floor and side walls.
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