Temperature measurement and simulation of long tunnel in cold region
GAO Yan
ZHU Yongquan
XIN Hao
Abstract：The change rules of temperature field of long tunnel in cold region is analyzed based on measured data,and the change rules of temperature field,frozen depth of tunnel and the application scope of thermal insulation layer under different ambient temperatures,original ground temperatures of surrounding,natural wind speeds,train running speeds and train running frequencies are studied based on numerical analysis.The results show that the tunnel may appear negative temperature distribution in cases that the ambient temperature or the original ground temperature of surrounding rock is low,the natural wind speed,the train running speed or the train running frequency is high,therefore,the cold-proof measures of long tunnels in cold regions should not be used only in the entrance.And thermal insulation layers have been unable to meet cold-proof requirements of long tunnels in cold regions when the ambient temperature is less than 15 ℃ and the duration of freezing is more than 45 d,in this case,it is necessary to take active heat preservation measures.
Keywords：railway tunnellong tunnelcold regiontemperature fieldfrozen depththermal insulation technology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 49-55 )