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Thermal behaviour of unloaded concrete tunnel lining through an innovative large-scale tunnel fire experimental testing setup

机译：卸载混凝土隧道衬砌的热行为通过创新的大规模隧道防火实验测试设置

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摘要

A full-scale tunnel fire test requires extensive preparation of the fire source and an empirical design setup of the tunnel to reach 1200 degrees C of tunnel fire temperature. This paper shows comprehensive experimental research on the method of designing a large scale fire test setup for new unloaded concrete tunnel segments. The thermal and spalling behaviour of fire-resistant Patent-MY-163281 composition concrete (PMC) tunnel lining segments are compared to those of a current construction project coded SPC. The tests were conducted to follow the RABT time-temperature curve. Unloaded tunnel segments were considered to minimise the effects of mechanical loading on the spalling and failure behaviour. The results show that the test setup could replicate the RABT time-temperature curve with a nominal difference. The temperatures decreased gradually, with the increasing depth of concrete cover from the surface exposed to fire, with the PMC segments less than SPC's. The PMC segments showed good concrete spalling resistance behaviour, but the SPC segments were severely spalled. The PMC tunnel lining showed better performance under tunnel fire compared to SPC lining with similar design strength. (C) 2021 Elsevier Ltd. All rights reserved.
机译：全尺寸的隧道防火测试需要大量准备消防源和隧道的经验设计设置，达到1200摄氏度的隧道火灾温度。本文介绍了对新型卸载混凝土隧道段设计大规模火灾试验设置的方法综合实验研究。将防火专利-My-163281组成混凝土（PMC）隧道衬片的热量和剥离行为与当前建筑项目编码SPC的SPC相比。进行测试以遵循rabt时间温度曲线。被卸载的隧道段被认为是最小化机械负载对剥落和失效行为的影响。结果表明，测试设置可以用标称差异复制rabt时间温度曲线。温度逐渐下降，随着暴露于火灾的表面的增加，混凝土覆盖的深度增加，PMC段小于SPC。 PMC段显示出良好的混凝土剥落阻力行为，但SPC段严重均匀。与具有相似设计强度的SPC衬里相比，PMC隧道衬里显示出隧道火灾的更好性能。 （c）2021 elestvier有限公司保留所有权利。

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