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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2016  >  16(4): 68-77
MU Ke, YUAN Kun, JIN Long, DONG Yuan-hong. Differential settlement of widened subgrade in cold and high-altitude permafrost regions[J]. Journal of Traffic and Transportation Engineering, 2016, 16(4): 68-77. doi: 10.19818/j.cnki.1671-1637.2016.04.007
Citation: MU Ke, YUAN Kun, JIN Long, DONG Yuan-hong. Differential settlement of widened subgrade in cold and high-altitude permafrost regions[J]. Journal of Traffic and Transportation Engineering, 2016, 16(4): 68-77. doi: 10.19818/j.cnki.1671-1637.2016.04.007
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Differential settlement of widened subgrade in cold and high-altitude permafrost regions

doi: 10.19818/j.cnki.1671-1637.2016.04.007

  • State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China

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  • Author Bio:

    MU Ke(1983-), male, senior engineer, PhD, +86-29-88853000, changdamuke@163.com

  • Received Date: 2016-06-10
  • Publish Date: 2016-08-25
    Abstract
  • In order to study the influence of heat absorption of widened subgrade surface on underlying permafrost's temperature and settlement in cold and high-altitude permafrost regions, a finite element model computing the differential settlement of widening subgrade based on the thermal-mechanical coupled theory was established and corrected by the monitoring data of practical engineering, the differential settlement distributions under diverse seasons, different filling heights and working conditions at sunny and shady slope sides were studied, and the optimal widened location of subgrade in permafrost regions was determined. Research result shows that the maximum melting depth and settlement of widened subgrade appear in autumn, October is most unfavorable for subgrade settlement, and disease characteristics are remarkable. When the filling height of subgrade is 4 m, the maximum differential settlement of subgrade is16.9cm and 1.1, 1.4, 1.7times larger in October than in July, January and April within 10 years. Within 10 years, when the filling heights of subgrade are 2, 4 and 6 m respectively, thedifferential settlements are 13.2, 16.9 and 18.1 cm respectively, so the differential settlement increases with the increase of filling height. Within 10 years, the maximum rising temperature of subgrade is 1.3 ℃ at sunny slope side and 0.6 ℃ at shady slope side, the maximum differential settlement of subgrade is 16.9cm at sunny slope side and 12.3 cm at shady slope side, so the temperature and settlement of widened subgrade change smaller at shady slope side than at sunny slope side. Even widening subgrade at shady slope side, the differential settlement of subgrade still results in a 2%-3% slope at the top of subgrade, the slope will result in the great additional stress of pavement, so that the diseases of pavement structure occur.

     

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