Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (6): 108-119.doi: 10.6040/j.issn.1672-3961.0.2024.152

• Civil Engineering • Previous Articles    

Working mechanism and calculation analysis of RECV pile for permanent support of deep foundation pit

LI Lianxiang1,2,3, CHE Xiuxi1,2, LI Weilong4, QIU Yefan1,2, ZHANG Shangru1,2, WANG Chuhan1,2   

  1. LI Lianxiang1, 2, 3, CHE Xiuxi1, 2, LI Weilong4, QIU Yefan1, 2, ZHANG Shangru1, 2, WANG Chuhan1, 2(1. Foundation Pit and Deep Foundation Engineering Research Center, Shandong University, Jinan 250061, Shandong, China;
    2. School of Civil Engineering and Hydraulic Engineering, Shandong University, Jinan 250061, Shandong, China;
    3. Shandong Hi-Speed Geotechnical Engineering Co., Ltd., Jinan 250102, Shandong, China;
    4. CTMG Investment Group Co., Ltd., Xi'an 710021, Shaanxi, China
  • Published:2025-12-22

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Abstract: Aiming at the problems of resource waste, environmental pollution caused by the ‘temporary’ nature of existing deep foundation pit support, the difficulty in controlling the flatness of the traditional circular support pile wall, and the obstruction of promoting permanent support, this study proposed an upper rectangular, medium-expanded, and lower circular variable section(RECV)pile as a permanent support structure for deep foundation pits. This study combined Rankine's earth pressure theory and elastic foundation beam method to derive the calculation formulas of bending moment, shear force and stress of the whole pile of RECV pile. The finite element method was used to establish the numerical model, and the reliability of the model was verified based on the engineering monitoring data. The horizontal displacement and bending moment characteristics of RECV pile and traditional circular pile as foundation pit supporting pile were simulated and compared. The numerical simulation results showed that under the condition of bolt support, the horizontal displacement of RECV pile was significantly smaller than that of traditional circular pile, which showed stronger anti-deformation ability and unit volume concrete support efficiency advantage. The theoretical calculation results were basically consistent with the simulation results, which could provide reference for the internal force calculation of RECV piles, lay a foundation for the technical theory and design method of RECV piles, and promote the development of permanent support technology.

Key words: foundation pit support, special-shaped pile, permanent support, finite element, elastic foundation beam

CLC Number: 

  • TU94
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