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Numerical Analyses of Pavement Deformation and Stress in Permafrost Regions

WANG Shuang-jie~1,2, HUANG Xiao-ming~2, HOU Shu-guang~2 (1.The First Highway Survey and Design Institute of China,Xi′an Shaanxi 710068,China;2.Transportation College of Southeast University,Nanjing Jiangsu 210096,China)  
Aimed at the thawing plates developed under the highway constructed in permafrost regions,two calculation models are chosen to analyze the displacement and stress of pavement from construction to operation,using ABAQUS software.Calculated results indicate that thawing settlement is the main deformation of subgrade and the maximum deformation appears in the middle of a road in permafrost regions,with a dished deformation profile.The maximum displacement point will offset with the offsetting of thawing plate.The maximum tension stress appears at the base bottom,which is sensitive to thawing settlement.At pavement top,the maximum compressive stress would appear at the place of axis load.The section size, embankment fill and pavement structure in the models are of representative in the Qinghai-Tibet highway.When the embankment height is 3.6 m,in despite of the thawing plate offsetting or not,the tension stress of base bottom will reach the tensile strength as the thawing plate depth reach 0.5 m,indicating that the thawing settlement is likely to cause pavement failure,therefore,the embankment height(3.6 m) is so called maximum height.
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