高寒高海拔特长公路隧道温度场分布效应

Study on Temperature Field Distribution Effect of Extra-long Highway Tunnel in Alpine and High-altitude Area

为了深入分析高寒隧道的温度场分布规律,依托西藏高寒高海拔珠角拉山特长公路隧道,采用数值模拟与数理统计的方法,重点探讨了隧道通风时间、围岩初始温度和隧道埋深3个变量下的围岩温度场分布规律,并引入调热圈概念,得到珠角拉山特长公路隧道调热圈深度与隧道通风时间函数关系式。研究结果表明:不同围岩初始温度下的调热圈是一样的;围岩径向深度越大,其温度变化对围岩初始温度变化越敏感;围岩初始温度越高,监测点的温度变化速率峰值越低,且整体温度变化速率也较小;根据Pearson相关系数分析,调热圈深度与隧道埋深、围岩初始温度无关。

In order to further analyze the temperature field distribution of the tunnel in alpine area,relying on an extra-long highway tunnel in Zhujiaola Mountain in Tibet s alpine and high-altitude area and using numerical simulation and mathematical statistics methods,the distribution law of temperature field of the surrounding rock was explored under three variables of tunnel ventilation time,initial temperature of surrounding rock and the burial depth above tunnel.The concept of the heat-regulating circle was introduced,and the relationship between the depth of the heat-regulating circle of the extra-long highway tunnel in Zhujiaola Mountain and the tunnel ventilation time was obtained.The results of the study show that the heat-regulating circles at different initial temperatures of the surrounding rock are the same;the greater the radial depth of the surrounding rock,the more sensitive its temperature change is to the change in initial temperature of the surrounding rock;the higher the initial temperature of the surrounding rock,the lower the peak value of the temperature change rate at the monitoring point,and the smaller the overall temperature change rate;according to the Pearson correlation coefficient analysis,the depth of the heat-regulating circle has nothing to do with the buried depth of the tunnel and the initial temperature of the surrounding rock.