Journal of Shandong University(Engineering Science) ›› 2026, Vol. 56 ›› Issue (3): 37-48.doi: 10.6040/j.issn.1672-3961.0.2025.184

• 土木工程 • Previous Articles     Next Articles

Calculation theory and design method for hanging foot piles in soil-rock dualistic foundation pits with stable rock mass

ZHAO Jing1, ZHANG Shangru2,3, LI Lianxiang2,3,4*, DAI Changshun5, CHEN Cheng1, WANG Peiyan2,3   

  1. ZHAO Jing1, ZHANG Shangru2, 3, LI Lianxiang2, 3, 4*, DAI Changshun5, CHEN Cheng1, WANG Peiyan2, 3(1. Guangzhou Metro Design &
    Research Institude Co., Ltd., Guangzhou 510010, Guangdong, China;
    2. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China;
    3. Foundation Pit and Deep Foundation Engineering Technology Research Center, Shandong University, Jinan 250061, Shandong, China;
    4. Shandong High-tech Geotechnical Engineering Co., Ltd., Jinan 250102, Shandong, China;
    5. Jinan Rail Transit Group Co., Ltd., Jinan 250101, Shandong, China
  • Published:2026-06-09

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Abstract: Aiming at the problems of the wide application of foot-hanging piles in soil-rock dualistic foundation pits with stable rock masses, yet the lack of consensus on their working mechanism and insufficient analytical calculation methods, this paper conducted an in-depth analysis of the mechanical mechanisms of four failure modes(circular arc, circular arc-plane, cutting plane, and sliding-shearing)and their variation laws with soil depth, derived a calculation formula for rock-embedded depth based on static equilibrium equations, and determined the quantitative criterion of the overall failure coefficient S considering the respective failures of soil and rock as well as the combined failure modes with different paths. Combined with engineering cases in Qingdao and Jinan, a design method was proposed, which included failure mode judgment, support type selection, rock-embedded depth calculation, and overall stability checking. The fully recoverable foot-hanging piles were applied in soil-rock dualistic foundation pits, and the fully recoverable support structure was optimized to promote the high-quality development of soil-rock dualistic foundation pits.

Key words: soil-rock dualistic foundation pit, foot-hanging pile, failure mode criterion, calculation theory, design method

CLC Number: 

  • TU43
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