Investigation of a Loaded Pile Responses Due to Proposed Deep Excavation in Sand Soil: Finite Element Analysis Using Plaxis3D Program

Document Type : Research Papers

Author

Associate Professor, Civil Engineering Department, Higher Institute of Engineering and Technology, New Minia, Egypt.

Abstract

Geotechnical design engineers are giving increasing attention to how piles respond to soil movements brought on by nearby braced excavations. This study investigates the effect of deep excavation on an adjacent loaded single pile on sand soil using the PLAXIS 3D finite element program. Leung et al. (2006) centrifuge test results were employed to verify the numerical model. The different parameters in this study were the excavation depth, type of pile head, diameter of pile, and the distance between the pile and the excavation. The results of the investigation demonstrated that the excavation depth (He) in proportion to the pile's length (Lp) has an important effect on pile responses. The case of (He/Lp = 2.0) leads a maximum lateral deflection at the pile toe of 24.80% from the diameter of pile. However, the lowest lateral deflection at the pile-0.85% of the pile diameter-occurs in the case where He/Lp = 0.5, which reduces. When He/Lp = 0.5, 1.0, the maximum value of bending moment of the pile occurs at around 0.70% normalized depth of the pile, or 230 and 298 kN.mm, respectively. Furthermore, the pile's response is greatly affected by the distance between it and the excavation site; after 10 meters, the value of bending moment in the pile is insignificant. Furthermore, it was found that while the maximum pile lateral deflection reduces as pile diameter increases, the bending moment along the pile remains constant. In this paper, the type of pile head was also discussed.

Keywords

References

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Civil Engineering Infrastructures Journal
Volume 58, Issue 1
June 2025
Pages 103-121

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History

  • Receive Date: 20 September 2023
  • Revise Date: 16 December 2023
  • Accept Date: 14 January 2024

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