【摘要】 寒区公路隧道一般要受到季节性冻融冻胀作用的影响,因而不可避免地引起一系列的隧道病害问题,不仅影响隧道的正常使用,而且危及结构的长期运营安全性。结合寒区公路隧道气候特点,选择外敷保温材料作为隧道的抗防冻措施;采用相变温度场有限元模型,对不同材料及厚度保温材料性能进行对比分析,并采用现场跟踪测试手段,研究保温层施作后围岩及衬砌的温度场分布,对保温材料的性能进行现场验证,给出了合适的寒区隧道保温层材料及厚度。更多还原

【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.更多还原