【摘要】 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．更多还原

【Abstract】 Based on the researches on constructions in frozen regions and Qinghai-Tibet Roadway and Railway, some related mechanics problems are proposed. They are: the temperature field in frozen soil under climate and engineering conditions; frost heaving and thaw settlement of permafrost roadbed; the support force of frozen soil under the roadbed; the frost heaving of many kinds of engineering constructions (especially culverts and stake bases); the influence of regenerative damages on railway bed; active protective measures for frozen soil damages. All problems may be classified into two kinds: one concerns heat stability, and the other dynamics stability. And the both problems are coupled.更多还原