Research purposes: When the train running speed and frequency increase, there is a certain difference between the length of cold proof and thermal insulation at the tunnel portal and the length recommended in the specification. Firstly, based on the unsteady heat conduction theory, superposition principle and Bessel equation, the theoretical solution of tunnel temperature field in cold area considering the influence of train wind is derived; Secondly, the influence of train speed and running interval on the temperature field distribution in the tunnel is analyzed; Finally, the suggestion of tunnel fortification length in cold area considering the influence of train wind is given.
Research conclusions: (1)The error between the theoretical solution of temperature field of tunnel in cold area considering the influence of train wind recommended in this paper and the field measurement is less than 10%, which can be applied to the design of cold proof and thermal insulation of tunnel in cold area. (2)The temperature field distribution in the tunnel is not affected by the train speed and running interval, but the longitudinal temperature curve in the tunnel shifts as a whole, increasing the length of negative temperature of the tunnel. (3)When the train speed is 100 km/h, 150 km/h, 200 km/h, 250 km/h, 300 km/h, 350 km/h and 400 km/h respectively, the cold proof and thermal insulation fortification length of tunnel portal needs to be increased by 45.76%, 65.55%, 84.65%, 110.31%, 127.02%, 155.21% and 222.70%. (4)When the train running interval is 30 min, 15 min, 10 min and 5 min, the cold proof and thermal insulation fortification length of tunnel portal shall be increased by 4.28%, 12.21%, 28.34% and 48.65%. (5)The research results can provide reference for cold proof and thermal insulation design of tunnels in cold regions.
Key words
tunnels in cold regions /
train wind /
temperature field /
theoretical solution /
cold proof and thermal insulation /
fortification length
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