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<p>To address the challenge of deformation control in foundation pit support systems located adjacent to slopes under conditions of rapid excavation, a composite support system composed of anti-slide piles, lattice beams and prestressed anchor cables is proposed. A combined commercial and residential project in Ningbo is used as a case study, integrating on-site monitoring with ABAQUS numerical simulations to systematically analyze the deformation behavior of the system under extreme construction conditions. The results demonstrate that compared with the traditional reinforcement scheme comprising sprayed concrete, anchor rods and lattice beams, the composite system achieves a reduction in horizontal displacement at pit crest by 15% to 35%; The deformation of the anti-slide piles exhibits a nonlinear attenuation, with the maximum displacement at the top of the pile measuring 9.54&#xa0;mm and less than 0.5&#xa0;mm at a depth of 16&#xa0;m; the long-term loss of prestress in the anchor cables is only 3.1%, indicating excellent structural stability. The numerical model error is approximately 10.82%, confirming its consistency with the field-observed mechanical behavior.Although both the “single row pile + anchor cable” and the “double row pile” can provide good reinforcement effects under the given concrete usage, the former has a slight advantage in terms of deformation control. This research extends the applicability of steep slope support technology and provides a scientific basis for real-time monitoring and early warning.</p>

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Deformation Behavior of Retaining Structures for Excavation Adjacent to Slopes Under Rapid Excavation Conditions

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Junhao Li,
  • Lijin Dong,
  • Guangyi Ku,
  • Changguang Qi

摘要

To address the challenge of deformation control in foundation pit support systems located adjacent to slopes under conditions of rapid excavation, a composite support system composed of anti-slide piles, lattice beams and prestressed anchor cables is proposed. A combined commercial and residential project in Ningbo is used as a case study, integrating on-site monitoring with ABAQUS numerical simulations to systematically analyze the deformation behavior of the system under extreme construction conditions. The results demonstrate that compared with the traditional reinforcement scheme comprising sprayed concrete, anchor rods and lattice beams, the composite system achieves a reduction in horizontal displacement at pit crest by 15% to 35%; The deformation of the anti-slide piles exhibits a nonlinear attenuation, with the maximum displacement at the top of the pile measuring 9.54 mm and less than 0.5 mm at a depth of 16 m; the long-term loss of prestress in the anchor cables is only 3.1%, indicating excellent structural stability. The numerical model error is approximately 10.82%, confirming its consistency with the field-observed mechanical behavior.Although both the “single row pile + anchor cable” and the “double row pile” can provide good reinforcement effects under the given concrete usage, the former has a slight advantage in terms of deformation control. This research extends the applicability of steep slope support technology and provides a scientific basis for real-time monitoring and early warning.