Temporal-spatial evolution laws of temperature field in cold region tunnel and temperature control measures

被引：9
|
作者：
Zhou X. [1 ,2 ]
Zeng Y. [1 ]
Fan L. [3 ]
Zhou X. [1 ,2 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, Sichuan
[2] China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan, 430050, Hubei
[3] Tunnel Section of First Civil Construction Design & Research Institute, China Railway Eryuan Engineering Group CO., LTD., Chengdu, 610031, Sichuan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2016年 / 37卷 / 03期
关键词：
Periodic air temperature; Surrounding rock; Temperature field; Thermal insulation layer; Tunnel in cold region; Tunnel lining;
D O I：
10.3969/j.issn.1001-4632.2016.03.07
中图分类号：
学科分类号：
摘要：
The unsteady heat transfer finite difference equations for surrounding rock, lining and air flow of tunnel in cold region were deduced. The accuracy of numerical solution was validated by comparing the field measured temperature field and calculated temperature field of railway tunnel under construction in cold region. The results show that, after the run-through of tunnel, as time goes on, the temperature variation curves of tunnel lining and surrounding rock show sine curve within a certain range from lining surface, which are the same with those of air flow temperature. Moreover, the temperature has smaller change and the phase lag is greater towards the radial depth of section. The temperature at the vault of the secondary lining is the highest and that on rail surface is the lowest. The average temperature of each measuring point is close to that of hance. The calculated value of the temperature of tunnel secondary lining is slightly lower than the measured one, but it still meets the precision requirements for engineering use. Adopting rigid polyurethane foam as the thermal insulation layer can effectively improve the temperature of tunnel lining and surrounding rock in cold region, and the efficiency is the highest when the thickness of thermal insulation layer is around 0.05 m. Both the external mounted and septum types of thermal insulation layers can play good thermal insulation effects, and the effect of external mounted type is better. Considering that the external mounted type is easy to maintain and replace while the septum type is liable to deform with water and extrusion, it is suggested to construct external mounted type of thermal insulation layer for cold region tunnel under the premise of the allowable materials and construction technology. © 2016, Editorial Department of China Railway Science. All right reserved.
引用
收藏
页码：46 / 52
页数：6
相关论文
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