Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (*SHRP 2 Prepublication Report)
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Greetings!
Because tunnels typically service high-volume traffic and operate in aggressive environments, keeping tunnels open during inspection and minimizing tunnel closures and user delays must be carefully balanced with the need to conduct detailed inspections to ensure the safety of drivers. The objective of SHRP 2 Project R06G (High-Speed Nondestructive Testing Methods for Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings) was to identify nondestructive testing technologies for evaluating the condition of various types of tunnel linings and tunnel lining finishes, and to evaluate the applicability, accuracy, precision, repeatability, ease of use, capacity to minimize disruption to vehicular traffic, and implementation and production costs of the identified technologies. The project also advanced hardware and software development for the most promising technologies and proved the validity of the selected technologies to detect flaws within or verify conditions of the targeted tunnel components. The final report documents these activities, and it also recommends test procedures and protocols to successfully implement these techniques.
* To make research available as early as possible, SHRP 2 is temporarily posting final reports that have been submitted by the research team, reviewed according to the relevant National Academy of Sciences procedures, and accepted for publication. These prepublication drafts, which have not been edited or formatted for publication, will be replaced by the final versions as they complete the editorial process.
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