Volume 39 Issue 1
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Meng Baohua, Ma Jingjing, Deng Yu, Wang Ning. Mechanical characteristics of retaining structure in an expansive soil area of Chengdu[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(1): 72-81. doi: 10.20265/j.cnki.issn.1007-2993.2023-0806
Citation: Meng Baohua, Ma Jingjing, Deng Yu, Wang Ning. Mechanical characteristics of retaining structure in an expansive soil area of Chengdu[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(1): 72-81. doi: 10.20265/j.cnki.issn.1007-2993.2023-0806
shu

Mechanical characteristics of retaining structure in an expansive soil area of Chengdu

doi: 10.20265/j.cnki.issn.1007-2993.2023-0806
  • 1.

    Capital Construction Division, The Third Hospital of Mianyang, Sichuan Mental Health Center, Mianyang 621000, Sichuan, China

  • 2.

    College of Modern Technology, Mianyang City College, Mianyang 621000, Sichuan, China

  • 3.

    Chengdu Surveying Geotechnical Research Institute Co., Ltd. of MCC, Chengdu 610023, Sichuan, China

  • 4.

    College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 623000, Sichuan, China

  • Received Date: 2023-10-23
  • Accepted Date: 2024-05-09
  • Rev Recd Date: 2024-04-20
  • Publish Date: 2025-02-21
    Abstract
  • In a foundation pit located in an expansive soil area in Chengdu, an h-type double-row pile + anchor cable support system was employed. FLAC 3D was used to conduct numerical simulations analyzing the effects of varying pile row spacing, and differences in pile top and bottom elevations. The analysis shows that when row spacings are less than five times the pile diameter (5d), increasing the spacing leeds to more reasonable force distribution on the piles. As the top of the front pile decreases, the bending moment and shear force shared by the rear pile increase, yet its maximum shear force remains lower than that of the front row. Elevating the rear row pile bottom resulted in a sharp decrease and misallocation of its bending moment and shear force. Based on these findings, the h-type double-row pile design was optimized by adding supporting blind ditches between tie beams and inclined drainage holes between piles, effectively mitigating expansive soil relaxation and preventing shear strength reduction due to moisture increases. Monitoring data confirmed effective deformation control and validated the reliability of the numerical model.

     

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