Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings

Periodic monitoring of tunnel conditions and deterioration rates is the answer to determining the appropriate schedule of maintenance or rehabilitation activities to remedy structural problems that could lead to rapid deterioration and unexpected tunnel failures. The aggressive environmental conditions in which tunnels exist, as well as the need to keep tunnels open to traffic, make their inspection a challenge. Nondestructive testingmethods that are automated, quantitative, and rapid, and that provide complete coverage compared with conventional visual inspections, could solve this dilemma. This report presents the findings of the Strategic Highway Research Program 2 (SHRP 2) Renewal Project R06G—High-Speed Nondestructive Testing Methods for Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings. The study was divided into two phases to (1) establish testing criteria and prioritize the techniques to be developed and evaluated under the project on the basis of tunnel operators’ requirements and (2) conduct the necessary technology development for those techniques recommended. In addition to conducting technology development, the project performed proof-of-concept and field testing. Beyond this report, the deliverables for this project include two products that will be published separately: 1) a user’s manual, which provides information on three NDT technologies for inspection of tunnels; and 2) a brief manual to the analysis software Tunnelcheck, which was developed under this project.

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