青藏铁路运营期间冻土路基裂缝问题研究

运营期青藏铁路冻土区路基工程最值得关注的变化是不同部位裂缝的发生和发展以及对线路安全运行的影响.通过对不同时期青藏铁路多年冻土区路基工程裂缝发生发展影响因素的分析,认为冻土区路基工程基底地温场的不对称以及基底土体冻融过程不同步是路基工程变形裂缝发生的主要原因,路基坡脚和周围冻土水热环境变化是裂缝发展的拉动力,路基填料性质也是不容忽略的因素;根据运营期间冻土路基热状态和工程状态分析,对运营期青藏铁路冻土路基工程状态进行了初步评价,并提出了减少或消除地温场的不对称及保护路基坡脚冻土环境,从而抑制冻土路基裂缝的工程对策.

Study on the Cracks on Permafrost Embankment during the Operation of Qinghai-Tibet Railway

The most remarkable change of the permafrost embankment during the operation of Qinghai-Tibet Railway is the occurrence and development of the cracks on different parts and their influence on the safe operation of the railway.Through analyzing the factors influencing the cracks on permafrost embankments of Qinghai-Tibet Railway in different periods,this paper holds that the dissymmetry of basal geothermal field and non-synchronous basal soil freezing and thawing process in permafrost embankment engineering ...