Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (2013) / Chapter Skim
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Pages 30-32
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30 C h a p t e r 4 Chapter 2 reports the advisory expert panel's findings on performance criteria, which indicated that NDT should be able to detect any defect within or immediately behind tunnel linings that have a minimum surface area of 1 sq ft, and any defect needs to be located within 1 ft of the actual location on the tunnel lining. The panel also noted that NDT should identify delaminated areas and voids up to 4 in.
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From page 31... ...
31 Table 4.1. Summary of Nondestructive Testing (NDT)
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From page 32... ...
32 each of these methods, however, the personnel in charge need to be sufficiently trained in data collection, reduction, and interpretation. Of the devices tested under this study, the handheld thermal camera appears to be the easiest to use and can be effectively used by tunnel owner personnel.
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