考虑地温影响的高海拔寒区隧道温度场分布规律研究

Study on Temperature Field Distribution of High-Altitude Tunnel in Cold Region Considering Ground Temperature

高海拔隧道由于其特殊地理条件,易导致进出口高程相差较为悬殊,致使隧道洞内外温差较大,同时隧道穿越山岭,原始地温随埋深变化而随之变化。本文针对高海拔寒区隧道提出一种用户自定义函数的数值计算方法,可精确描述高海拔隧道埋深与原始地温之间的关系。通过红原2号隧道实例验证,该方法可较好地模拟隧道不同区段的原始地温,冬季时,隧道进深1300和3500 m处,洞壁最低温度分别为-5.49℃和-0.07℃;隧道进口风速为3.32 m/s,中部风速为2.66 m/s,数值计算结果相比理论计算结果存在-12.86%误差。研究成果可为西成铁路沿线隧道建设提供防寒保温建议。

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 1300 m and 3500 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.