钢壳混凝土沉管隧道管节结构热量传递规律试验研究  

Experimental Study on the Law of Heat Transfer of Tube Structure of the Steel-concrete-steel Immersed Tube Tunnel

作　　者：蒋树屏 李静[1] 张丹丹[1] 曹鹏[2] JIANG Shuping;LI Jing;ZHANG Dandan;CAO Peng(Chongqing Jiaotong University,Chongqing 400074;China Merchants Chonging Communications Technology Research&Design Institute Co.,Ltd,Chongqing 400067)

机构地区：[1]重庆交通大学,重庆400074 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《现代隧道技术》2023年第1期168-178,共11页Modern Tunnelling Technology

基　　金：国家重点研发计划(2021YFC3002000);国家自然科学基金(52127814);重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0591)。

摘　　要：为了解钢壳混凝土组合结构的耐火性能,进而为其结构设计、防火保护提供依据,利用自主研发的多功能大型耐火试验炉,在不同防火保护方案下,进行局部全尺寸构件耐火试验,研究钢壳混凝土沉管隧道管节结构在火灾高温下的热量传递规律。结果表明,火灾中防火板对管节结构有明显保护作用,无防火板保护情况下构件竖向位置出现明显的混凝土脱空现象;防火板背火面测点温度值均随炉膛温度变化呈现规律性变化,但两者并不完全同步,防火板背火面测点温度变化滞后于炉膛温度变化;火灾高温下管节结构的温度影响深度达到距离底板上表面约550 mm,混凝土断面热量传递高度约400 mm。To understand the fire resistance of steel-concrete-steel composite structure and further provide the basis for its structural design and fire protection, the multifunctional large refractory-lined test furnace which is independently developed was used for the fire resistance test of local full-sized elements in different fire protection schemes to research the law of heat transfer of the tube structure of steel-concrete-steel immersed tube tunnel at high temperature caused by a fire. The results show that fireproof plates can greatly protect the tube structure in a fire, and if no fireproof plates are used for protection, obvious voids in concrete will appear in the vertical position of elements;the temperature value at each measuring point on the unexposed surface of a fireproof plate regularly varies with the hearth temperatures, but they do not completely synchronize, and the temperature changes in the measuring point on the unexposed surface of a fireproof plate lag behind those of the hearth;the depth of temperature influence on the tube structure at high temperature caused by a fire reaches about 550 mm from the upper surface of bottom plate, and the height of heat transfer of the concrete section is about 400 mm.

关 键 词：隧道工程 钢壳混凝土沉管隧道 结构构件 防火试验 热量传递规律 

分 类 号：U459.5[建筑科学—桥梁与隧道工程] U214.41[交通运输工程—道路与铁道工程]