中文摘要：

针对环境升温和冻结层下承压水二者共同作用下小厚度多年冻土的退化过程进行数值分析。利用有限元分析软件ANSYS数值模拟了多年冻土区30 a环境升温1.56℃,天然地表下20 m深度处0.6℃冻结层下承压水共同作用下地温场。结果表明,冻结层下水对小厚度多年冻土退化影响较大,致使冻土下限抬升;环境升温对冻土上限下移影响有限。

英文摘要：

As the permafrost environment in Tibetan Plateau is changing with global warming, it is urgent to have a further study on the interaction between permafrost degradation and engineering buildings. In this paper, the degradation process value of the small thick- ness permafrost under environmental warming and the confined water under permafrost is mainly analyzed. By ANSYS numerical simu- lation, the temperature field is simulated which is influenced by permafrost zone 30 a with 1.56 ~C elevated atmospheric temperature and confined water under 0.6 ~C freezing layer at 20 m underground. Results show that the subpermafrost water has a great influence on the degradation of the small thickness permafrost and raises the permafrost base while global warming has a limited influence on permafrost table descending. The combined effects lead to a general heating up of the permafrost soil and decreasing of its thickness. All these changes will have a direct impact on the construction project, such as a shortage of pile foundation bearing capacity, large deformation, and even engineering diseases.