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Sciences in Cold and Arid Regions ›› 2016, Vol. 8 ›› Issue (6): 461-466.doi: 10.3724/SP.J.1226.2016.00461

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Calculation method for thickness of discontinuous boundary layer of engineering pavement

ZhongQiong Zhang1,2, QingBai Wu1,2, Peng Zhang1, SiRu Gao1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. Beiluhe Observation Station of Frozen Soil Environment and Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2016-06-12 Revised:2016-08-17 Published:2018-11-23
  • Contact: ZhongQiong Zhang, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. Tel: +86-931-4967433; E-mail: zhongqionghao@163.com E-mail:zhongqionghao@163.com
  • Supported by:
    This research was supported by the Natural Science Foundation of China (41330634 and 41301071), and the Independent Research Project of State Key Laboratory of Frozen Soil Engineering (SKLFSE-ZQ-19). We would like to express our sincerest gratitude to the anonymous reviewers for providing us with constructive and insightful comments and suggestions.

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Abstract: The boundary layer is a buffer layer of water and heat exchange between the atmosphere and permafrost. Based on the atmospheric boundary layer and heat transfer theory, we established a method for determining the boundary layer thickness of engineering pavement (asphalt and sand pavement) in permafrost region. The boundary layer can be divided into the Boundary Layer Above Surface (BLAS) and the Boundary Layer Below Surface (BLBS). From in-situ monitoring data, the thickness of BLAS was determined through the laminar thickness, and the thickness of BLBS was determined through ground temperature, the heat conduction function, and the mean attenuation function (α). For asphalt pavement, the BLAS thickness varied between 2.90 and 4.31 mm and that of BLBS varied between 28.00 and 45.38 cm. For sand pavement, the BLAS thickness varied between 2.55 and 3.29 mm and that of BLBS varied between 15.00 and 46.44 cm. The thickness varied with freezing and thawing processes. The boundary layer calculation method described in this paper can provide a relatively stable boundary for temperature field analysis.

Key words: boundary layer, scope, average attenuation coefficient, pavement, permafrost

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