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Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions

Author

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  • Zhang, Mingyi
  • Zhang, Xiyin
  • Li, Shuangyang
  • Wu, Daoyong
  • Pei, Wansheng
  • Lai, Yuanming

Abstract

The crushed-rock interlayer embankment with ventilation ducts has been advocated to stabilize the permafrost stratum under expressways in permafrost regions. This embankment must render better cooling effect than railway embankments because the expressway surface is wider and hotter. To this purpose, the walls of the ventilation ducts need to be perforated. This study evaluates the cooling performance of the rushed-rock interlayer embankments with unperforated and perforated ventilation ducts along an expressway in permafrost regions of the Qinghai-Tibet Plateau. A three-dimensional numerical model is developed based on heat and mass transfer theories. The model includes the coupled heat transfer between air and ventilation duct wall, the air convective heat transfer in crushed-rock layer, and the heat conduction with phase change in soil layers. The numerical results indicate that if the ventilation ducts are perforated and embedded at the top of the crushed-rock interlayer, the cooling effect of the embankment can be greatly enhanced. A good cooling performance can still be achieved even if the centerline spacing of the perforated ventilation ducts is enlarged to 4 m to facilitate the construction. The crushed-rock interlayer embankment with perforated ventilation ducts is a better candidate structure for expressways in permafrost regions of the Qinghai-Tibet Plateau.

Suggested Citation

  • Zhang, Mingyi & Zhang, Xiyin & Li, Shuangyang & Wu, Daoyong & Pei, Wansheng & Lai, Yuanming, 2015. "Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions," Energy, Elsevier, vol. 93(P1), pages 874-881.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:874-881
    DOI: 10.1016/j.energy.2015.08.059
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    Citations

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    Cited by:

    1. Chen, Lin & Lai, Yuanming & Fortier, Daniel & Harris, Stuart A., 2022. "Impacts of snow cover on the pattern and velocity of air flow in air convection embankments of sub-Arctic regions," Renewable Energy, Elsevier, vol. 199(C), pages 1033-1046.
    2. Ma, Qinguo & Luo, Xiaoxiao & Gao, Jianqiang & Sun, Weiyu & Li, Yongdong & Lan, Tianli, 2022. "Numerical evaluation for cooling performance of a composite measure on expressway embankment with shady and sunny slopes in permafrost regions," Energy, Elsevier, vol. 244(PB).
    3. Chen, Lin & Yu, Wenbing & Zhang, Tianqi & Yi, Xin, 2023. "Asymmetric talik formation beneath the embankment of Qinghai-Tibet Highway triggered by the sunny-shady effect," Energy, Elsevier, vol. 266(C).
    4. Yinghong Qin & Tianyu Wang & Weixin Yuan, 2023. "Wind-driven device for cooling permafrost," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    5. Yanhu, Mu & Guoyu, Li & Wei, Ma & Zhengmin, Song & Zhiwei, Zhou & Wang, Fei, 2020. "Rapid permafrost thaw induced by heat loss from a buried warm-oil pipeline and a new mitigation measure combining seasonal air-cooled embankment and pipe insulation," Energy, Elsevier, vol. 203(C).
    6. Yang, Sheng & Zhang, Mingyi & Bi, Jun & Pei, Wansheng & Li, Guanji & Li, Renwei, 2023. "Evaluation of the long-term thermal stability of a crushed-rock revetment embankment in pan-Arctic permafrost regions under the effect of snow drift," Energy, Elsevier, vol. 263(PB).

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