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Study of infrared thermal application for detecting defects within tunnel lining

机译：红外热探测隧道衬砌缺陷的研究

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摘要

With the aging of tunnels, additional maintenance and assessment procedures are required to monitor their working conditions. The passive thermal infrared method, which is a nondestructive contact-free method, is used to find defects in a box-type and shield tunnels with concrete lining. In this study, this method is numerically applied to detect defects in an unhealthy concrete structure. The thermal field data measurements are reviewed and the governing heat transfer mechanisms for a defected concrete surface are presented. The heat transfer in the concrete segment, tunnel air, and the air inside the void due to the conduction, convection, and radiation mechanisms is explained. Further, the type of cavity, the temperature difference between the healthy and unhealthy concrete surfaces, the temperature difference between the tunnel air and concrete surfaces, and the influence of the void depth on the detection accuracy are investigated. The results show that the temperature difference between the concrete surface and the tunnel air is more than 0.35 degrees C, which is an ideal condition for detecting the voids with an approximate depth of 30 mm or less.
机译：随着隧道的老化，需要额外的维护和评估程序来监视其工作条件。被动热红外方法是一种非破坏性的无接触方法，用于在带有混凝土衬砌的箱式和屏蔽隧道中发现缺陷。在这项研究中，此方法在数值上用于检测不健康的混凝土结构中的缺陷。回顾了热场数据的测量，并提出了缺陷混凝土表面的主要传热机理。解释了由于传导，对流和辐射机理引起的混凝土段中的热传递，隧道空气以及空隙内部的空气。此外，研究了空腔的类型，健康和不健康的混凝土表面之间的温度差，隧道空气和混凝土表面之间的温度差以及空隙深度对检测精度的影响。结果表明，混凝土表面与隧道空气之间的温差大于0.35摄氏度，这是检测深度约为30毫米或更小的空隙的理想条件。

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