青藏铁路多年冻土区路基变形特征及影响因素分析  

Analysis on Subgrade Deformation Features and Influence Factors in Permafrost Regions on Qinghai-Tibet Railway

作　　者：董昶宏[1,2] 赵相卿 

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中铁西北科学研究院有限公司,兰州730000

出　　处：《铁道标准设计》2013年第6期5-8,共4页Railway Standard Design

基　　金：科技部科研院所技术开发研究专项资金项目(2011EG123262);铁道部科技研究开发计划重点课题(2010G015-B)

摘　　要：青藏铁路自修建运营以来,路基下伏多年冻土因热稳定条件改变而对地上工程产生了一系列影响,其影响因素主要有线路走向、太阳辐射、气温、水分迁移、工程措施等。经研究发现,路基变形主要反映为冻胀和融沉,其中融沉变形在冻土路基变形中占主导地位。路基变形量与线路走向、冻土温度、工程地质特性等影响因素密切相关,路基阴阳坡差异越大,路基变形量越大;冻土温度越高,路基变形量越大;路基变形主要出现在高温高含冰量路段,含冰量与融沉量呈等比关系。Since the construction and operation of the Qinghai-Tibet Railway, there have been a series of influences on those projects located above the ground, because the thermal stability conditions of the permafrost under the subgrade have already been changed. The main influence factors usually include the route alignment, solar radiation, air temperature, water migration, project measures and so on. By researching, it has been found that the subgrade deformations come into being mainly in the forms of frost heaving and thaw settlement, and the thaw settlement plays a more dominant role in subgrade deformations. In addition, the subgrade deformations are closely related to the route alignment, frozen soil temperature, engineering geological features and other factors. Especially, the subgrade deformation increases with the increase of the difference between the sunny slope and the shady slope of the subgrade ; the higher the frozen-soil temperature rises, the larger the subgrade deformation becomes. Moreover, the subgrade deformations mainly occur in warmer and ice-rich sections, and there is an equal ratio relationship between ice content and thaw settlement.

关 键 词：青藏铁路 多年冻土 路基 变形特征 影响因素 

分 类 号：U213.14[交通运输工程—道路与铁道工程]