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  Thermal analyses of passive infrared thermography application in the tunnel lining with defects

  The existence of cracks and defects are common problems in old underground tunnels. In some cases, defections or large cracks might result in accidents because of concrete block spalling during operational hours. Infrared thermography is a nondestructive method to detect hidden defects in the concrete lining of tunnels by taking thermal images from the surface of defected area.By taking thermal images of the defected concrete lining, non-visual subsurface abnormalities can be detected by temperature difference around the defected area. This study demonstrates thermal analyses of the two cases of passive infrared thermography application in a RC box-type tunnel. The temperature of the tunnel air, the damaged and undamaged concrete surface, and outside air are measured by time. A numerical model is used to perform the thermal analyses of these two measurement cases. The tunnel air is introduced into the model and then the concrete surface temperature is calculated for the two cases. By comparing the void detection feasibility of the two cases in this study, it was found that the average trend of tunnel air temperature is more important than the extent of temperature variation for cavity detection.

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