多年冻土区路基融沉变形分析

摘要

基于UL描述的大变形固结理论和考虑相变作用的温度场,通过联系方程,建立了大变形融化固结理论.假定未来50年升温2.6℃的条件下,对路基运营若干年后的热、力学状况进行分析.结果表明；路基对冻土上限有一定的抬升.路基中心的变形最大,远离中心的地表处最小.路基变形随着融化范围的增大而增加.此外,不同运营时间的路基变形速率不同.随着年平均地温的升高,路基沉降也随之增大.%Based on the large strain consolidation theory considered the phase change in heat transfer process,the thaw consolidation mathematical model was established.Assuming the global temperature will rise by 2.6 ℃ in the next 50 years,analyzed the thermal and mechanics conditions of the embankment after construction.The result shows that the embankment raised the permafrost table.The maximum settlement happened at the centre of the embankment and the minimum at the nature ground.With the service time increased,the thaw region increased.The settlement increased with the thaw region increased.Furthermore,the deformation rate is difference at different service times.The settlement increases with the mean annual ground temperature descends.