Laying Method and Design Parameter Optimization of the Thermal Insulation Layer in Alpine and Altitude Tunnels

被引：0

作者：

Wang Z.-J. ^{[1
]}

Zhou F.-C. ^{[1
]}

Zhou P. ^{[1
]}

Jiang Y.-F. ^{[1
]}

Li J.-Y. ^{[1
]}

Du Y.-L. ^{[2
]}

Du Y.-W. ^{[1
]}

Deng Y.-H. ^{[1
]}

机构：

[1] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, Sichuan

[2] Structural Health Monitoring and Control Key Laboratory of Hebei Province, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei

来源：

Zhou, Ping (852907757@qq.com) | 1600年 / Chang'an University卷 / 33期

关键词：

Alpine and high altitude; Highway tunnel; Insulation layer; Laying method; Numerical simulation; Parameter optimization; Road engineering;

D O I：

10.19721/j.cnki.1001-7372.2020.08.018

中图分类号：

学科分类号：

摘要：

To study the laying method and design parameters of the thermal insulation layer in alpine tunnels, the laying method, design thickness, and thermal conductivity of thermal insulation layers were thoroughly studied through numerical simulation, and the relationship between local temperature change and the design parameters of the thermal insulation layer were discussed. The results show that the wall-mounted laying method is the best in the insulation layer fortified section of the tunnel in cold regions. With increased insulation layer thickness, the influence range of cold air in the tunnel decreases. The trend of the diameter depth of the heat regulating ring changing with the insulation layer thickness is expressed as follows: f(xh)=3.039e-0.280 9xh+13.8e-0.009 322xh. Based on the change rate curve of the diameter depth of the heat regulating ring with an increased insulation layer thickness and tunnel structure safety, it is suggested that the insulation layer thickness should be designed to be between 5 and 10 cm. With increased thermal conductivity of the insulation material, the cold air influence range in the tunnel increases. The relationship trend between the diameter depth of the heat regulating ring and the thermal conductivity is expressed as follows: f(xλ)=15.47e0.287 4xλ-3.829e-39.05xλ. Based on the rate curve of the diameter change and heat regulating ring depth with thermal conductivity and tunnel structure safety, it is suggested that the thermal conductivity of thermal insulation materials should be between 0.020 and 0.035 W•(m•K)-1. Under an assumed thickness of a 5 cm thermal insulation layer, a thermal conductivity of 0.022 2 W•(m•K)-1, and a ventilation time of 4 months, only when the tunnel temperature is higher than -15℃, can the supporting structure and surrounding rock be protected from freezing damage. The research results can provide safety guidance for the Sichuan-Tibet Railway. © 2020, Editorial Department of China Journal of Highway and Transport. All right reserved.

引用

页码：182 / 194

页数：12

共 19 条

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