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根据已有的寒区工程研究资料和关于青藏公路和铁路的不断研究成果,总结了青藏铁路建设中存在的冻土力学问题,具体表现为:气候和工程影响下路基下冻土温度场变化;多年冻土路基的冻胀和融沉变形;路基的冻土承载力(动载、静载)的变化;修建的各种工程结构物下的冻胀力(特别是涵洞和桩基);次生灾害对铁路路基的影响;主动保护冻土的冻害防治措施问题.这些力学问题可以从大类上分为热学稳定性和力学稳定性两部分,但这两部分是相互耦合的．
According to the existing cold engineering research data and the continuous research results on the Qinghai-Tibet Highway and the railway, this paper summarizes the existing problems of the frozen soil mechanics in the construction of the Qinghai-Tibet Railway, including the changes of the temperature field in the frozen soil under the influence of climate and engineering, Frost heave and thawing settlement of permafrost subgrade; changes of permafrost bearing capacity (dynamic load and static load) of subgrade; frost heaving force (especially culverts and pile foundation) under construction of various structures; The impact of natural disasters on railway subgrade, and the active prevention and control measures of frost damage on permafrost.These mechanical problems can be divided into two parts: thermal stability and mechanical stability, but these two parts are mutually coupled.