路基高度对高纬度多年冻土区路基温度场的影响

Influence of subgrade height in subgrade temperature field on high latitude permafrost regions

基于附面层理论,建立伴有相变的二维非稳态温度场数值模型,分析不同路基高度下高纬度多年冻土区路基温度场与融化深度的变化规律,为多年冻土区设计合理路基高度及病害防治提供参考。结果表明:高纬度多年冻土区路基温度场的变化随季节而周期循环变化;随着时间的增加,路基下的地温也随之升高;路基高度越低,融化深度越大。从长期来看,不同高度路基下多年冻土上限均有下降趋势。

Based on boundary layer theory,the establishment of two-dimensional numerical model with phase non steady temperature field,analysis of the variation law of the temperature field and the melting depth of the roadbed in the high latitude permafrost regions,provide the basis for the design of permafrost zone height and reasonable subgrade disease prevention. The results show that temperature field of roadbed changes with seasonal cycle in the high latitude permafrost regions; the embankment increases with the increase of time and the temperature; the roadbed height is lower,the depth of melting is greater. In the long run,permafrost has a downward trend at different heights.