寒区隧道保温隔热层的设置是至关重要的一环，对隧道的顺利施工和安全运营起决定性的作用。根据传热学相关理论知识，对寒区隧道的保温隔热层材料导热系数进行推导，得出材料导热系数或保温层厚度的计算方法，并运用公式法和数值分析得到了在相同条件下，保温层设置在隧道里面的保温效果要比设置在隧道衬砌表面好的结论。%The construction of heat-insulating layer is an important part of cold region tunnels ,and it plays a decisive role during the construction and operation periods .Based on heat transfer theory ,some formulas of the thermal conductiv-ity were deduced here ,and the formula method and numerical simulation were used to obtain the conclusion .Under same conditions ,the insulation effect of the heat-insulating layer inside tunnel is better than that on tunnel lining surface .
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