Abstract:The railway tunnels in cold region are a tube-type building with both ends exposed.Due to the influence of air pressure,natural wind and train piston wind,the temperature inside the tunnels is obviously affected by the ambient temperature outside. In the change of temperature and alternation of freezing and thawing, there will be ice hanging on the arch wall and ice deposited at the bottom of the tunnel due to structural water leakage, and the crack of lining due to frost-heaving surrounding rock or cavity water behind the structure, which have become the main issues troubling the tunnel operation in cold region. Therefore, freezing-resistant technology is the key to the railway tunnel construction in cold region. Centering on the characteristics of cold region, the paper systematically discusses the technical characteristics for freezing-resistant design, construction, and operation and maintenance of tunnels, providing a reference for the standardization of tunnel freezing-resistant engineering. 

Keywords: railway tunnel; cold region; freezing resistance and prevention; insulation layer; drainage system 

Source: Chinese Railways No.4 2021 Serial No.56