寒区隧道围岩径向温度传播规律对隧道保温设计具有重要的指导意义。目前寒区温度场的研究多为现场实测与理论分析2个方面。为得到寒区隧道支护结构与围岩温度沿径向变化的规律，自行研制了温度模拟足尺试验仪器，并在此基础上开展了无隔热层与有隔热层2种条件下的模拟试验，分析了隧道围岩径向温度场变化规律。结果表明： 模拟环境温度为-12.5 ℃条件下，无隔热层时，90 h时环境温度降到-9 ℃，初喷混凝土层与围岩的交界面处的温度降低至0 ℃，当温度进一步降低时，围岩出现冻结状态，且随着时间的推移，冻结范围逐步扩大，192 h时环境温度降低到-12.5 ℃，各界面温度基本达到稳定； 设置4.5 cm隔热层时，由于隔热层作用，450 h时支护结构混凝土及围岩内的温度均大于0 ℃。结合试验最后确定了隔热层、隧道支护混凝土与围岩的导热系数与导温系数，结果可为寒区隧道保温设计提供依据。

Radial propagation of temperature field of surrounding rocks of tunnel in cold regions is the key to design of thermal insulation. The study of temperature field of surrounding rocks of tunnel in cold regions focuses on site monitoring and theoretical analysis. Full scale testing device for temperature simulation is developed, on basis of which simulation tests with and without thermal insulation layer are carried out; and the radial propagation laws of temperature of surrounding rocks and support structure of tunnel in cold regions are analyzed. The study results show that: 1) The temperature of contact face between primary shotcrete and surrounding rocks is 0 ℃ after 90 h under the conditions of environmental temperature of -9℃ and no thermal insulation layer; and the surrounding rocks froze when the temperature keeps going down. The temperatures of every interface of structure become stable after 192 h and under condition of stable environment temperature of -12.5 ℃. 2) The internal temperatures of support structure and concrete are larger than 0 ℃ after 450 h under the conditions of environmental temperature of -12.5 ℃ and thermal insulation layer of 4.5 cm thickness. 3) The thermal conductivity and the thermal diffusivity of the thermal insulation layer, support concrete and surrounding rocks of the tunnel are determined. The results can provide reference for thermal insulation design of tunnels in cold region.