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    YANG Zhihao, CHENG Shi'ao, YUE Zurun, FENG Huaiping, ZHAO Dejie, MA Deliang, LI Tonghai. Multifactorial influence patterns and resistance mechanisms of frost-jacking characteristics in conical piles[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1382-1391. DOI: 10.11779/CJGE20240657
    Citation: YANG Zhihao, CHENG Shi'ao, YUE Zurun, FENG Huaiping, ZHAO Dejie, MA Deliang, LI Tonghai. Multifactorial influence patterns and resistance mechanisms of frost-jacking characteristics in conical piles[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1382-1391. DOI: 10.11779/CJGE20240657
    shu

    Multifactorial influence patterns and resistance mechanisms of frost-jacking characteristics in conical piles

    • 1.

      State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

    • 2.

      School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

    • 3.

      China Railway Liuyuan Group Co., Ltd, Tianjin 300308, China

    • 4.

      China Railway 17th Bureau Group Co., Ltd., Taiyuan 030006, China

    Funds: 

    the National Natural Science Foundation of China 52302518

    the Natural Science Foundation of Hebei Provence E2023210054

    the Shijiazhuang City Outstanding Youth Project for Basic Research in Hebei Province Universities 241790557A

    the Science and Technology Project of Hebei Education Department CXZX2025005

    More Information
    • Received Date: July 07, 2024
    • Revised Date: February 17, 2025
    • Accepted Date: February 24, 2025
    • Available Online: February 24, 2025
    • Published Date: February 25, 2025
      Graphical Abstract
      • Abstract
    • To investigate their evolution characteristics of frost-jacking behavior and their resistance mechanisms, a testing device for the anti-frost-jacking performance of conical piles is developed. The unidirectional freezing tests on the conical piles are conducted to analyze the effects of pile materials, cone angles, soil moisture contents around the piles and freeze-thaw cycles on their frost-jacking performance as well as their anti-frost-jacking mechanisms. It is indicated that under the same conditions, the frost-jacking displacement of the piles decreases exponentially with the increase in the cone angles. As the number of freeze-thaw cycles increases, the growth rate of the frost-jacking displacement for vertical piles increases in a semi-logarithmic manner, while changes in the conical piles are not significant. The pile materials have a significant impact on the frost-jacking characteristics of the conical piles, and the wooden pile may experience thawing extraction. During the unidirectional freezing process, the moisture within the soil surrounding the piles migrates upward from the bottom. The greater the initial moisture contents, the more pronounced the migration, leading to larger frost-jacking displacements. However, the effects of the moisture contents on the frost-jacking displacement are weaker than those of the cone angles. During the freezing process of the soil around the piles, the freezing depth increases, the tangential frost-jacking force on the pile surface increases, and the normal frost jacking force gradually decreases from compressive stress to tensile one. When these two forces exceed the tangential freezing strength of the soil and the ultimate normal tensile strength, the frost-jacking of the piles occurs. Considering the resistance to frost jacking, economic factors and the protection of frozen soil, the cone angles of the anti-frost-jacking conical piles should be designed to be between 7° and 9°, but the pile depth must also be taken into account.
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      • References (16)
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