Volume 39 Issue 5
Oct.  2025
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2025  >  39(5): 667-673
Du Zhaomeng, Liu Tianxiang, Wu Yunlin, Lei Hang, Li Chao, Yuan Wen. Stability of deep foundation pit anchored by thick accumulation in high intensity earthquake area[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 667-673. doi: 10.20265/j.cnki.issn.1007-2993.2024-0092
Citation: Du Zhaomeng, Liu Tianxiang, Wu Yunlin, Lei Hang, Li Chao, Yuan Wen. Stability of deep foundation pit anchored by thick accumulation in high intensity earthquake area[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 667-673. doi: 10.20265/j.cnki.issn.1007-2993.2024-0092
shu

Stability of deep foundation pit anchored by thick accumulation in high intensity earthquake area

doi: 10.20265/j.cnki.issn.1007-2993.2024-0092
  • 1.

    Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu 610041, Sichuan, China

  • 2.

    Sichuan Transportation Construction Group Co., Ltd., Chengdu 610041, Sichuan, China

  • Received Date: 2024-03-01
  • Accepted Date: 2024-05-09
  • Publish Date: 2025-10-10
    Abstract
  • The stability of anchor foundation pit is the main control factor affecting the safety of suspension-bridge engineering. A suspension-bridge in Sichuan is located in a high-intensity earthquake area, which anchorage foundation pit is located in thick accumulation. The maximum slope height of the foundation pit slope is 110 meters. Taking the anchorage foundation pit project as an example, research is conducted on the long-term stability of a foundation pit over 100 meters deep on a thick accumulation. By conducting in-situ density tests, on-site shear tests, and deformation tests, the strength and deformation characteristics of the foundation pit soil were studied, and the physical and mechanical parameters of the foundation pit soil were obtained. The application of finite difference software for seismic simulation calculation of anchor foundation pit shows that deep accumulation foundation pit is prone to deformation and even sliding instability and failure under strong earthquakes. The maximum displacement of the slope is about 20 m, and the thickness of the slope instability range is about 15~23 m. Based on this, the two-level requirements for bridge foundation pit protection and comprehensive treatment measures of excavation pre-reinforcement, step-by-step excavation, and zoning protection are proposed. The dynamic and time-historical analysis method was used to verify the stability of the foundation pit under this treatment measure. The results show that the maximum displacement of the reinforced slope after 30 seconds of Wenchuan earthquake wave input was only 0.223 m. The monitoring data for 36 consecutive months after the excavation and support of the foundation pit show that the maximum displacement of the slope was less than 9.05 mm, which was basically consistent with the numerical calculation results, verifying the effectiveness of the reinforcement measures and numerical calculation methods.

     

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