QUAN Lei, TIAN Bo, NIU Kai-min, XIE Jin-de, HE Zhe, ZHANG Ying-hui. Temperature variation properties of pavements and subgrades for high-grade roads on Qinghai-Tibet Plateau[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 21-30.
Citation: QUAN Lei, TIAN Bo, NIU Kai-min, XIE Jin-de, HE Zhe, ZHANG Ying-hui. Temperature variation properties of pavements and subgrades for high-grade roads on Qinghai-Tibet Plateau[J]. Journal of Traffic and Transportation Engineering, 2017, 17(2): 21-30.

Temperature variation properties of pavements and subgrades for high-grade roads on Qinghai-Tibet Plateau

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  • Author Bio:

    QUAN Lei(1987-), male, assistant researcher, PhD, +86-10-62079598, quanleirioh@126.com

    TIAN Bo(1973-), male, researcher, PhD, +86-10-62079598, b.tian@rioh.cn

  • Received Date: 2016-11-21
  • Publish Date: 2017-04-25
  • The temperatures of different deeps of roads and natural ground were continuously measured in permafrost regions on Qinghai-Tibet Plateau, and the variation tendencies of daily mean temperature (DMT) with time and depth, and the frequency distributions of real-time temperature and the freeze-thaw properties of different structural layers were analyzed.Analysis result shows that the annual change rules of DMTs of air, surface layer, base layer, subgrade and natural ground demonstrate high-temperature periods and low-temperature periods, and the corresponding shifting times are April and September.The DMT of surface layer of asphalt concrete pavement varies from-17 ℃ to 40 ℃ in yearly observation period, and the DMT of surface layer of cement concrete pavement varies from-18℃to 17℃.At 0.8 m-depth from the top surface of subgrade under asphalt concrete pavement and 0.7 m-depth from the top surface ofsubgrade under cement concrete pavement, the DMTs vary from-2.8 ℃to 6.3 ℃ and from-3.4 ℃to 5.4 ℃, respectively.The frequency distributions of temperatures and temperature gradients of air, surface layer of asphalt concrete pavement and surface layer of cement concrete pavement display obvious single-peak shapes, and there are deviations between the temperatures or temperature gradients corresponding to the peak values and the annual mean values.The frequency distributions of temperatures of base layer, sub-base layer and subgrade present multipeak shapes, and the peak values correspond to low-temperature period, high-temperature period and their transition period, respectively.The freeze-thaw cycles of surface layers of asphalt concrete pavement and cement concrete pavement are 182 and 178 in yearly observation period, respectively.The frequency distributions of freeze-thaw lasting times of asphalt concrete pavement and cement concrete pavement have one main peak and several sub-peaks, respectively, and the main peak usually appear in the interval of 0-2 hor 18-20 h.Obviously, it is given priority to choose cement concrete pavement in order to protect the permafrost in permafrost regions, and the freeze-thaw durability performance shall be verified in the mix proportion design of asphalt concrete and cement concrete.

     

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