#br# 寒区隧道温度场的围岩热学参数影响及敏感性分析

寒区隧道抗防冻设计受周边温度场控制，隧道围岩的热学参数直接影响温度场分布。本文依托某寒区公路运营隧道，采用现场实测、数值仿真和理论推导三种方法对寒区隧道温度场分布和围岩热学参数的影响敏感度进行了系统研究。首先，通过对比分析有限元计算结果和现场监测数据，验证了有限元计算分析的准确性。然后，采用该有限元分析方法，基于敏感性分析方法，对围岩导热系数、比热容和赋存温度三个因素对寒区隧道温度场的影响进行了敏感性分析。结果表明，三个因素的影响敏感度具有明显差异，其中赋存温度是影响隧道温度场最敏感参数。研究成果可为寒区隧道选址及类似工程的抗防冻设计提供参考。

Influence and sensitivity analysis of surrounding rock thermal parameters on temperature field of cold region tunnel

The anti-freezing design of tunnel in cold region is controlled by the surrounding temperature field, and the thermal parameters of tunnel surrounding rock have a direct influence on the distribution of temperature field. In this paper, based on a cold highway operation tunnel, the distribution of temperature field of tunnel in cold region and the sensitivity of thermal parameters of surrounding rock are systematically studied by three methods of field measurement, numerical simulation and theoretical deduction. Firstly, the accuracy of finite element analysis is verified by comparing the results of finite element calculation and field monitoring data. Then, based on the sensitivity analysis method, the sensitivity of the three factors of the thermal conductivity, the specific heat capacity and the occurrence temperature of the surrounding rock to the temperature field in the cold region tunnel is analyzed by using the finite element method. The results show that the sensitivity of the three factors is obviously different, and the occurrence temperature is the most sensitive parameter affecting the temperature field of the tunnel. The results of research can provide reference for site selection of tunnel in cold region and anti-freezing design of similar engineering.