Study on Distribution Rule of Temperature Field in Tunnel in Extremely High Altitude Cold Area
In order to solve the problem of tunnel freezing in high-cold and high-altitude areas,a large number of temperature sensors were deployed at different locations in four sections of a tunnel.Based on-site monitoring,the temperature field distribution and freezing depth of surrounding rock and lining and different locations of tunnels in extremely high altitude cold areas are studied.The results show that:1)The tunnel temperature changes periodically with the season,and the frost damage is the most serious at 10 m of the entrance;2)The tunnel lining temperature is negatively correlated with the longitudinal depth of the tunnel,and the peripheral rock temperature is positively correlated with the radial depth of the tunnel;3)In the most unfavorable section of the tunnel,the temperature of the vault is higher than that of the waist and foot of the arch;4)The freezing depth is the largest in the arch foot at 10 m of the entrance,and the affecting range of freezing depth of the tunnel is 0-250 m.The results of the study can provide a basis and guidance for the construction of tunnels in the cold area and the thermal insulation against freezing.
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