漠北公路高纬度多年冻土区路基变形特征分析

Analysis of Subgrade Deformation Characteristics in Circumpolar Latitude Permafrost Regions Along Mohe-Beiicun Highway

为探讨东北高纬度岛状多年冻土区路基路面病害原因,对漠北公路沿线冻土路基不均匀沉降变形状况进行了分析。基于漠北公路沿线不同冻土条件和工程措施下各层土体沉降变形状况,探讨路基沉降变形主要发生的土层部位、路基沉降变形破坏原因等。分析结果表明:路基施工完成后早期路基变形较大,主要由工后不均匀沉降变形引起,变形部位主要发生在原天然地面下季节活动层;由于运营时间较短,由多年冻土融化引起的沉降变形很小。路基沉降变形主要发生在暖季,在冷季(11月～次年6月)路基基本保持稳定,变形很小。路基整体变形状况与冻土含冰量、冻土地温有一定的关系。高温多年冻土区比低温多年冻土区变形大。

In order to explore and discuss the causes of embankment and pavement in circumpolar latitude patchy permafrost regions in the northeast of China,the uneven settlement of embankment along the Mohe-Beijicun Highway is analyzed.Based on the deformation condition of each soil layer under the different of permafrost conditions and engineering measures,the mainly soil layer occurred the deformation,and the causes of damage are explored and discussed.The result shows that the initially deformations of embankment is large as a result of post-construction uneven settlement of the season activities layer under the original natural ground.The settlement of embankment occurred mainly in the warmer season,the roadbed kept stability and the deformation is small in the colder season（November-next June）.The deformation of embankment had to do with the ice contents,the temperature of permafrost.The deformation of embankment is larger in high temperature permafrost regions than that in low temperature permafrost regions.