【作者】 原思成；

【导师】 张鲁新；

【作者基本信息】 北京交通大学 ， 道路与铁道工程， 2007， 博士

【摘要】 作者通过冻土学的基本理论并结合国内外的工程经验以及青藏铁路的特点，以来自铁路正线的变形和温度观测资料为基础，结合计算和数值预测，对青藏铁路冻土区路基变形和地温的现状以及发展趋势进行了分析研究和评价，认为目前青藏铁路冻土区路基变形趋于稳定，地温呈降低趋势，采用主动降温工程措施的冻土区路基工程基本处于稳定状态，未来运营期间青藏铁路冻土区路基稳定性可以得到保证，但是在个别的特殊地段需要重点观察，必要时需进行补强。文中对冻土路基的工程划分和对冻土路基变形发生、发展过程的阶段划分，属于创新的分类，并且，对于冻土变形机理的分析和结论，也是作者首次提出的。论文中的主要结论已经被青藏铁路的工程实践所证明是正确的，部分建议已经在工程中采纳。更多还原

【Abstract】 In this paper the author analyzed the monitor data of roadbed deformation and ground temperature of Qinghai-Tibet railway and concluded that the deformation of permafrost roadbed is made up of frost-heaving and the deformation of thawing-collapse of soil of seasonal thawing layer and compression deformation of frozen soil with relative higher temperature under the frost-thawing interface. Thawing and freezing process of roadbed in permafrost region and its results under the effects of different environmental temperature and permafrost temperature are the mechanics and controlling factors of the roadbed deformation. And author classified roadbed construction in permafrost region of Qinghai-Tibet railway into three types which are roadbed constructions with low environmental atmospheric temperature and ground temperature, high environmental atmospheric temperature and low ground temperature, and high environmental atmospheric temperature and ground temperature. Analysis of deformation monitor data and computer simulation show that the deformation of the roadbed at present is stable and safe and the development trend of it can guarantee the safety of the railway in the following decades. But in the sectors of simple fill roadbed and low-height roadbed the reduction of fill temperature and lifting of permafrost table are limited because of the limitation of such roadbed structure. Therefore additional measures such as thermal rod roadbed structure should be used in such sectors in order to lift permafrost table, reduce ground soil temperature and guarantee the stability of roadbed construction in permafrost region.更多还原