高地温隧道隔热层方案优化设计及应用——以尼格隧道为例

Optimization Design and Application of High Temperature Tunnel Thermal Insulation Layer Scheme:Taking the Nigel Tunnel as an Example

为优化高地温隧道隔热层的设计及应用方案,以红河州建(个)元高速公路尼格隧道为工程背景,采用正交试验及数值模拟相结合的方法,研究了隧道风速、导温系数、围岩温度和隔热层的厚度对隧道内环境温度的影响。结果表明:夹心式硬质聚氨酯泡沫塑料隔热层对降低高地温隧道内环境温度有显著的作用,影响隧道内环境因素的顺序为隧道内风速、围岩温度、导温系数和隔热层的厚度;导温系数为0.02 W/(m·K)、厚度为5 cm的隔热层敷设方案,可将尼格隧道内的环境温度控制在31.45℃以下。该研究结果可为优化高地温隧道的隔热层设计提供参考。

In order to optimize the design and application scheme of high temperature tunnel insulation layer,the influence of tunnel wind speed,thermal conductivity coefficient,surrounding rock temperature and the thickness of insulation layer on the ambient temperature in the tunnel was studied by using the method of field test,orthogonal test and numerical simulation with the Nige tunnel of Honghe State,Jian(Ge)Yuan highway as the engineering background.The results show that the sandwich rigid polyurethane foam insulation layer has a significant effect on reducing the ambient temperature in the high temperature tunnel.The primary and secondary order of the environmental factors affecting the tunnel is the wind speed in the tunnel,the surrounding rock temperature,the thermal conductivity and the thickness of the insulation layer.The application of the thermal insulation layer laying scheme with the thermal conductivity of 0.02 W/(m·K)and the thickness of 5 cm can control the ambient temperature in the Nige tunnel below 31.45℃.The research results can provide a reference for optimizing the insulation layer design of high temperature tunnel.