对多年冻土地基处理措施的认识  

Study of the Measures of Foundation Treatment in the Permafrost Regions

作　　者：曹元平[1] 

机构地区：[1]铁道第一勘察设计院地质路基处,甘肃兰州730000

出　　处：《冰川冻土》2003年第B08期43-48,共6页Journal of Glaciology and Geocryology

摘　　要：为指导青藏铁路多年冻土区路基工程的设计、施工,在清水河试验段布置了倾填片石路基、热棒路基、通风管路基、加筋路堤试验工程。多年冻土区路堤的融沉、纵向裂缝关系到铁路的安全运营,设计、科研单位对此进行了大量的观测及调查工作。介绍了上述各试验工程及对比段路基的设计,竣工一年后各试验工程的最大冻融交接面、融沉、纵向裂缝情况,并从冻融交接面的形态方面分析了各试验工程在9～10月所产生的纵向裂缝。In order to maintain the frozen condition of soil below permafrost table, the cold storage in the embankment should increase. Thus, Russian scientists proposed some principles to actively and well protect the frozen ground. In keeping with these principles, some test engineering, such as roadbed made of lots of sheet stone, ventilation embankment and heat pipe, etc. , were arranged in the construction of the Qingshui River Section of the Qinghai-Tibet Railway. At the same time, reinforced soil embankment, one of the test engineering, was also designed to prevent longitudinal cracks in the paves of the roadbed and both slopes.Thawing deformation and longitudinal cracks in the roadbed in permafrost regions have something to do with the operation safety of the railway. From the end of November 2001, carefully observing the ground temperature and the deformation of the test engineering started. The observation shows that all the maximum thawing lines of the test roadbed elevated a little, to some extent, so did the permafrost table. Until October 2002, the maximum thawing settlement of the upper pave of the embankment, in contrast to the sheet stone roadbed, the ventilation pipe one, the reinforced soil one and the ventilation one made up of the sheet stone, has reached the range from 203 to 283 mm, and the upper pave's thawing settlement also has arrived at 40 mm or so.From September 2002, there have been some longitudinal cracks in the road-shoulder slopes and the revetment. In this paper, longitudinal cracks of the contrasted sections and all the roadbeds mentioned above are introduced, such as the sheet stone roadbed, the ventilation pipe one, the reinforced soil one and the ventilation one made up of the sheet stone, etc. Moreover, the longitudinal cracks relating to the shape of the freezing-thawing interface of all the test engineering also analyzed.It is believed from the above analyses that, for dealing with the frozen ground roadbed, one should not only ensure the elevation of the permafrost table, but also

关 键 词：冻土 地基 处理措施 融沉 纵向裂缝 冻融交界面 

分 类 号：U213.14[交通运输工程—道路与铁道工程]