新筑冻土路堤温度场的变化过程

Temperature field evolution in newly-built permafrost embankment

采用有限单元法 ,通过综合考虑各种边界条件及模拟路堤修筑的蓄热作用 ,对路堤修筑后温度场逐年变化过程进行了计算研究 ,得到了不同高度路基温度场年稳定变化的年限及逐年变化较大的年限、融土核存在及变化规律 ,指出浅层土温度分布的非对称性有冬季强、夏季弱的特点 ,通过最低和最高温度的比较发现 ,深层土温度变化滞后于表层土及气温约

With the consideration of all the boundary conditions and the accumulated heat functions, the change process of temperature field in newly built permafrost embankment is calculated by FEM when the embankment is constructed. The temperature field in embankment with various height,the year limits with greater changes and with steady changes are obtained. The existence of soil melt cores and their change regulation are found in the embankment. The non symmetric characteristics of temperature distribution in the subgrade surface soil is strong in winter and weak in summer. In comparisons of the lowest temperature and the highest temperature, it is found that the temperature in the deep soil changes 5 months later than those in the surface soil and atmospheric temperature.