Study on Temperature Field Distribution of High-Altitude Tunnel in Cold Region Considering Ground Temperature
Due to the special geographical conditions of high-altitude tunnels,it is easy to cause a large elevation difference between the entrance and exit,resulting in a large temperature difference inside and outside the tunnel.At the same time,the tunnel passes through mountains,so the original ground temperature changes with the tunnel depth depth.This paper proposes a user defined function numerical calculation method for the tunnel in high-altitude cold regions,which can accurately describe the relationship between the tunnel depth of high-altitude tunnels and the original ground temperature.Through the case verification of Hongyuan No.2 Tunnel,it shows that this method can well simulate the original ground temperature in different sections of the tunnel.In winter,the lowest temperature of the tunnel wall is-5.49℃and-0.07℃respectively at the depth of 1 300 m and 3 500 m of the tunnel;the wind speed at the entrance of the tunnel is 3.32 m/s,and the wind speed in the middle of the tunnel is 2.66 m/s.The numerical calculation results have an error of-12.86%compared to the theoretical calculation results.The research results can provide thermal insulation suggestions for the construction of tunnels along the Xi'ning-Chengdu Railway.
high altitudetunnel in cold regionoriginal ground temperaturetemperature fieldnumerical calculation
NETL
NSTL
万方数据
