Thermal characteristics investigation of a high-speed railway tunnel by field monitoring in Northeast of China. (September 2021)

• Record Type: Journal Article
• Authors: Jiang, Haiqiang; Niu, Fujun; Ma, Qinguo; Jiang, Wangtao; Hu, He; Wang, Enliang; Jiao, Chenglong; Li, Zhiguo
• Is Part Of: Transportation geotechnics. Volume 30(2022)
• Publication Date: 2021-09
• Subjects: Thermal characteristics -- In-situ monitoring -- Cold regions -- Wind; Engineering geology -- Periodicals; Soil mechanics -- Periodicals; Rock mechanics -- Periodicals; Transportation -- Periodicals; 624.15105
• DOI: 10.1016/j.trgeo.2021.100615
• Languages: English
• ISSNs: 2214-3912

Abstract

Graphical abstract: Comprehensive environmental factors at tunnel site, including air temperature, ground temperature, wind speed and wind direction, were monitored from 2018 to 2020. The effects of these factors and topography on thermal characteristics inside the tunnel were analyzed and discussed in details, especially in freezing period. Highlights: The change laws of temperature inside tunnel are discussed. The influence factors of thermal characteristics inside the tunnel are analyzed. The frost depth and frost index in different sections are revealed. Abstract: Thermal characteristics of tunnel in cold regions determine whether it will be affected by frost damage. Within this context, a series of key environmental factors were recorded by filed monitoring, such as temperature, wind speed and wind direction at tunnel site. The results demonstrate that environmental factors, topography and tunnel orientation codetermine the thermal characteristics inside the tunnel. In the coldest day, the temperature of air and tunnel structure distributed in the asymmetric parabola curve except surrounding rock. Meanwhile, the temperature of surrounding rock is always positive in the whole monitoring period, which varied slightly with season. The wind speed inside the tunnel is directly affected by that outside the tunnel, especially at ends of tunnel. With the distance increasing from tunnel entrance to the exit, the frost depth and frost index first decreased and then increased. Additionally, the temperature of all monitoring points in the same section increased with the distance from the sidewall to surrounding rock. This study can provide some information about the thermal characteristics and references for design and maintenance of the cold-regional tunnels.