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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2007  >  7(1): 58-62
Mao Xue-song, Li Ning, Wang Bing-gang, Hu Chang-shun. Analysis model of stress and deformation of permafrost subgrade with phase changing[J]. Journal of Traffic and Transportation Engineering, 2007, 7(1): 58-62.
Citation: Mao Xue-song, Li Ning, Wang Bing-gang, Hu Chang-shun. Analysis model of stress and deformation of permafrost subgrade with phase changing[J]. Journal of Traffic and Transportation Engineering, 2007, 7(1): 58-62.
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Analysis model of stress and deformation of permafrost subgrade with phase changing

  • 1.

    School of Water Resources and Hydro-electric Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China

  • 2.

    Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

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  • Author Bio:

    Mao Xue-song(1976-), female, PhD, associate professor, +86-29-82334452, xuesongxian@yahoo.com.cn

  • Received Date: 2006-08-16
  • Publish Date: 2007-02-25
    Abstract
  • Based on the temperature field control equations of permafrost subgrade, the numerical two-dimension equations of its stress field and deformation field were put forward, the influence of water phase changing from moisture to ice on the instant deformation and creep deformation of soil was synthesized, the frost-heaving model of subgrade was experimented on january, the changing laws of the stress and deformation of permafrost subgrade surface were analyzed. It is pointed that the extreme stress and deformation of permafrost subgrade surface are determined by frost-heaving velocity within frost-heaving region; the maximum value of subgrade vertical displacement is at slope bottom, and deceases to the middle and the left boundary of subgrade little by little; with the increasing of frost-heaving velocity, the crack of subgrade surface tends to the middle of road from the slope bottom; the location of the maximum stress of subgrade surface is consistent with that of the maximum vertical displacement; road stress mainly lies in the phase changing region of moisture convergence. Analysis result shows that the phase changing of subgrade is the direct reason of subgrade frost-heaving damage, the analysis of the stress field and deformation field is an effective method to study the mechanism of permafrost subgrade damage.

     

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