寒区铁路隧道温度场分布规律研究

Research on Distribution Rule of Railway Tunnel Temperature Field in Cold Region

为进一步分析外界环境温度对寒区铁路隧道围岩温度场的影响,通过数值计算得到环境温度对围岩温度、冻结深度以及隧道周边温度的影响规律。研究结果表明:5m围岩深度范围内的围岩温度变化较大,10m可达围岩初始温度;围岩冻结深度随环境温度的变化规律可用二次多项式进行拟合表现,随着计算时间的增加,围岩温度表现为先降低再保持平稳,洞周温度表现为从仰拱到拱顶逐渐增高的分布趋势。通过研究得到了围岩径向温度、隧道周边温度以及冻结深度随外界环境温度的变化规律,可为依托工程及类似工程的设计和施工提供借鉴和参考。

In order to further analyze the influence on the surrounding rock temperature field of railway tunnel in cold region, the influence rules of ambient temperature on the temperature of surrounding rock, freezing depth and temperature around the tunnel are obtained through numerical calculation. The research results show that: the temperature of surrounding rock changes greatly within the depth of 5m, and the initial temperature of surrounding rock can be reached within 10m;the rule that the freezing depth of surrounding rock changes with ambient temperature can be fitted by quadratic polynomial. With the increase of calculation time, the temperature of surrounding rock decreases first and then remains stable, and the temperature around the tunnel shows the distribution trend of gradually increasing from inverted arch to arch crown. The rules that radial temperature of surrounding rock, temperature around the tunnel and freezing depth change with the external environment temperature are obtained through the research, so as to provide reference for the design and construction of supporting projects and similar projects.