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Volume 40 Issue 6
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WANG Teng-fei, LIU Jian-kun, TAI Bo-wen, LÜ Peng. Model tests on frost jacking behaviors of helical steel piles[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1084-1092. DOI: 10.11779/CJGE201806014
Citation: WANG Teng-fei, LIU Jian-kun, TAI Bo-wen, LÜ Peng. Model tests on frost jacking behaviors of helical steel piles[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1084-1092. DOI: 10.11779/CJGE201806014
shu

Model tests on frost jacking behaviors of helical steel piles

  • 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. Qinghai Research and Observation Base, Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Region, Qinghai Research Institute of Transportation, Xining 810000, China;
    3. Tianjin Municipal Engineering Design & Research Institute, Tianjin 300041, China;

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  • Received Date: December 20, 2016
  • Published Date: June 24, 2018
    Graphical Abstract
    • Abstract
  • The foundations of the photovoltaic frames suffer from uneven frost heave of the soils during cold seasons, triggering generation inefficiency or even the total failure of superstructures. As a result, the helical steel piles (HSP) are widely adopted to deal with frost diseases in engineering practices. A small scale experiment is conducted to assess the jacking behaviors of different helical piles and the piles with no helix exposed to unidirectional freexing. Then, the variation laws of the temperature, jacking displacement and axial uplift force are summarized. The results indicate: (1) The average frost jacking rate ηj is determined as the reasonable index in terms of anti-jacking ability. In this study, ηj of the large half-helix pile is the least, with the value of 1.03 %, and ηj of the multi-helix one is the largest; (2) There is a linear relationship between the jacking displacement and the frost depth, and the layout of helices has impact on the development of frost jacking; (3) With the vertical displacement of the pile restrained, the axial uplift force grows exponentially over the frost depth. Thus, the research results can provide reference to address the frost jacking problems of lightweight structures in seasonally frozen regions.
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    • References (24)
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