Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 869-875.doi: 10.13278/j.cnki.jjuese.201503201

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Influencing Factors of Low Embankment Soil Subgrade Strength in Seasonally Frozen Region

Zhan Gaofeng1,2, Zhu Fu1,2, Dong Weizhi2, Wang Jing2   

  1. 1. Construction Engineering college, Jilin University, Changchun 130026, China;
    2. School of Transportation Science and Engineering, Jilin jianzhu University, Changchun 130118, China
  • Received:2014-08-08 Published:2015-05-26

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Abstract:

Through the investigation of filling height and freezing depth of the low embankment high-grade highway soil in Jilin Province, the filling height of the low embankment is found in the range of 0.0 m to 2.2 m in the investigated region. The maximum frozen soil depth is 1.6 m to 2.4 m based on the drilling data. Three kinds of embankment soils with different plasticity indices were selected from seasonal frozen soil regions. The testing schedules were made with the method of orthogonal design(L16(45)). By using the static molding method,the soil samples were compacted differently in its different moisture contents and compactness. After setting freeze-thaw cycles,the unconfined compressive resilient modulus of the soil samples were tested respectively. For the same kind of soil under the different influencing conditions, the experiment results show that the influence of different factors are as following: moisture content> freeze-thaw cycles> compactness. With the increase of themoisture content, the embankment soil strength decreases linearly; with the increase of freeze-thaw cycles, the embankment soil strength decreases, the first and second cycles create a greater impact on embankment soil strength. With the increase of compactness, the embankment soil strength increases, but increasing percentage is small. According to the indoor experiment data, the exponential function is adopted for multiple nonlinear fitting that deliver good results.

Key words: seasonally frozen region, low embankment, soil subgrade strength, influencing factors, Jilin Province, plasticity indices

CLC Number: 

  • TU411.6

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