青藏高原岛状多年冻土区路基变形治理效果分析  

Treatment effect of subgrade deformation in island-like permafrost area of Qinghai Tibet Plateau

作　　者：杨印海 韩龙武 赵相卿 张芳 孟进宝 YANG Yinhai;HAN Longwu;ZHAO Xiangqing;ZHANG Fang;MENG Jinbao(Northwest Research Institute Co.,Ltd.of China Railway Engineering Corporation,Lanzhou 730000,China;Qinghai Province Key Laboratory of Permafrosl and Environmental Engineering,Golmud 816000,China)

机构地区：[1]中铁西北科学研究院有限公司,兰州730000 [2]青海省冻土与环境工程重点实验室,格尔木816000

出　　处：《干旱区资源与环境》2020年第10期126-131,共6页Journal of Arid Land Resources and Environment

基　　金：中铁科学研究院有限公司重点创新项目(2016-KJ015-Z013-03);宁夏回族自治区科技厅重点项目(2019BFG2013)资助。

摘　　要：近年来青藏高原冻土区的路基容易发生融沉现象,究其原因,全球变暖、冻土的季节性变化和人为因素等因子都是导致这种现象的根源。为了青藏铁路的运营安全,对处于岛状多年冻土区的变形路基,通过片石护坡和热棒相结合的方式进行补强。文中根据青藏铁路长期观测系统数据,对路基变形原因,结合路基两侧的天然孔和人工孔进行了路基变形程度、地面孔地温曲线、路基两侧的融化进程曲线等数据分析。结果显示:通过上述治理工程措施,岛状冻土区的冻土人为上限有所抬升,路基本体趋于稳定;由于路基自重和行车荷载等因素作用下路基产生蠕变,从而导致路基发生沉降。The roadbed located in the permafrost region of the Qinghai-Tibet Plateau is prone to thaw and sink,because of the interference of global warming,seasonal variation of frozen soil and human factors.In order to ensure the operation safety of the Qinghai-Tibet railway,the embankment in the island-like permafrost area is reinforced by the combination of block stone subgrade and thermal probe subgrade.Based on the long-term observation data of Qinghai-Tibet railway,we analyzed the causes of subgrade deformation,combined with the natural and artificial holes on both sides of the subgrade,such as the degree of subgrade deformation,the surface temperature curve,the melting process curve on both sides of the subgrade.The results show:through the above engineering measures,the artificial upper limit of frozen soil in the island-like frozen soil area is raised,and the subgrade is basically stable;creep occurs under the long-term load such as the self-weight of subgrade and driving load,which leads to the subgrade settlement.

关 键 词：青藏铁路 路基变形 人为上限抬升 片石路基 热棒路基 

分 类 号：U213.1[交通运输工程—道路与铁道工程]