Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (5): 120-129.doi: 10.6040/j.issn.1672-3961.0.2024.135

• Civil Engineering • Previous Articles    

The working mechanism of HLC composite steel pile with full recovery in foundation pit

LI Lianxiang1,2,3, QIU Yefan1,2*, HAN Yiming1,2, ZHANG Julian4, LI Qingzhong5, CHE Xiuxi1,2   

  1. LI Lianxiang1, 2, 3, QIU Yefan1, 2*, HAN Yiming1, 2, ZHANG Julian4, LI Qingzhong5, CHE Xiuxi1, 2(1. Shandong University Foundation Pit and Deep Foundation Engineering Technology Research Center, Jinan 250061, Shandong, China;
    2. College of Civil Engineering and Water Conservancy, Shandong University, Jinan 250061, Shandong, China;
    3.Shandong Hi-Speed Geotechnical Engineering Co., Ltd., Jinan 250102, Shandong, China;
    4. Shanghai Hongxin Equipment Engineering Co., Ltd., Shanghai 201806, China;
    5. Ruima Wanjian(Anhui)Construction Protecting Technology Co., Ltd., Maanshan 243003, Anhui, China
  • Published:2025-10-17

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Abstract: To optimize the application of HLC composite steel piles in foundation pit support and solve the problem of unclear soil pressure sharing between H-shaped steel and steel sheet piles in the existing design, this study adopted a combined method of theoretical analysis, on-site measurement, and numerical simulation. The calculation formulas for the moment of inertia of HLC composite steel piles in ideal and actual states were derived. The calculation methods for the section stiffness reduction coefficient and the synergy coefficient were proposed. The variation law of the stiffness reduction coefficient of HLC composite steel piles along the depth was analyzed to characterize the working performance of the overall structure. The results showed that the earth pressure sharing ratio of each supporting pile did not conform to the theoretical stiffness distribution law, with that of a single steel sheet pile reaching up to 10%. The actual supporting stiffness should take into account the interaction between the supporting units. This study could provide a theoretical reference for the design of cantilever HLC foundation pit support structures.

Key words: HLC steel pile, steel sheet pile, section stress, stiffness reduction, cooperativity coefficient

CLC Number: 

  • TU392.1
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