Abstract
To fully understand the temperature distribution of cold regions and the variation law of temperature fields in cold‐region tunnels, this paper presents a case‐history study on a tunnel located on the eastern Qinghai‐Tibet Plateau, China. The conclusion is as follows: the temperature outside the tunnel and the ambient temperature are affected by wind speed and light. The law of the temperature field in the tunnel is greatly affected by wind speed and wind direction. According to the field test, the wind speed in the tunnel is about 2.8 m/s in winter, and the daily average temperature at the exit of the tunnel is basically lower than that at the entrance. From the central to the entrance, the temperature in the tunnel decreases by 0.11°C every 10 meters along the longitudinal direction; from the central to the exit, the temperature in the tunnel increases by 0.07°C every 10 meters. In this regard, for the problems of lining frost damage and central drainage pipe freezing, it is suggested to adopt the way of heating and drainage, but heating the freezing area outside the drainage pipe should be avoided. The test results can provide references for the design, construction, and research of the temperature field of the tunnel antifreezing system in the cold region. It is hoped that the test results can be useful in the design and construction of frost damage prevention systems and the investigation of temperature fields in cold‐region tunnels.
Highlights
Permafrost regions account for approximately 23% of Earth’s surface, mainly in Russia, Canada, China, and the US state of Alaska [1,2,3]
There are obvious differences between the exit and the entrance, and the primary reasons for which are as follows: (1) the natural wind continually blows from the exit to the entrance. us, the temperature curves tend to be more intensive from the exit to the entrance. (2) e entrance of the tunnel’s right tube, which is used as a construction passage for the left tube, has a tremendous effect on the temperature in the tunnel. erefore, the wind direction
According to the annual wind direction monitored in the tunnel, the natural wind blows from the tunnel exit to the entrance during winter, and the entrance average wind speed is approximately 2.8 m/s
Summary
Permafrost regions account for approximately 23% of Earth’s surface, mainly in Russia, Canada, China, and the US state of Alaska [1,2,3]. Tunnelling in cold regions changes the thermal balance of rock masses. The temperature range in which cold-region engineering is practiced is significantly influenced by the thermal conductivity of the soil-rock media, which is related to engineering problems caused by frost heave [4,5,6]. When frost heave occurs because of low temperatures, the properties of the rock mass change, and frost deformation significantly affects tunnel stability. Frost damage, such as peeling, lining surface fractures, seepage, icing, slippery collapse, and tunnel freeing port freezing, is primarily caused by freeze-thaw cycles. Frost damage, such as peeling, lining surface fractures, seepage, icing, slippery collapse, and tunnel freeing port freezing, is primarily caused by freeze-thaw cycles. e substantial difference in air temperature between morning and evening significantly weakens service capacity and life
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callSimilar Papers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
