Abstract Highway tunnel in cold region is generally influenced by freezing-thawing and frost-heave action. Disaster problems of tunnels are unavoidably induced，which will not only affect regular tunnel service，but also endanger long-term safety of tunnel. Based on climate characteristics of high-cold highway tunnel，outer insulating layer is selected as frost-resistant measures；and phase-change temperature field of finite element model is adopted to comparatively analyze the heat-insulating properties of different insulating materials and different thicknesses. In-situ test is used to verify the distribution of temperature field after insulating layer being considered；and performances of different insulating layers are also testified. Suitable insulating materials and corresponding thicknesses are provided for practical engineering.
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Received: 25 September 2006
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