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LIU Yuanyuan, SUN Jianlin. A simplified analysis model for vertical vibration of a single pile in unsaturated soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(4): 513-519. doi: 10.20265/j.cnki.issn.1007-2993.2024-0452
Citation: LIU Yuanyuan, SUN Jianlin. A simplified analysis model for vertical vibration of a single pile in unsaturated soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(4): 513-519. doi: 10.20265/j.cnki.issn.1007-2993.2024-0452
shu

A simplified analysis model for vertical vibration of a single pile in unsaturated soil

doi: 10.20265/j.cnki.issn.1007-2993.2024-0452
  • 1.

    Jiangxi College of Construction, Nanchang 330052, Jiangxi, China

  • 2.

    Jiangxi Normal University, Nanchang 330025, Jiangxi, China

  • Received Date: 2024-10-05
  • Accepted Date: 2025-06-26
  • Rev Recd Date: 2025-02-17
  • Publish Date: 2026-08-08
    Abstract
  • The dynamic response of a single pile in homogeneous unsaturated soil subjected to vertical harmonic load is investigated. The soil around the pile is regarded as a solid-liquid-gas three-phase medium, and a simplified vertical vibration model of a single pile in unsaturated soil under harmonic load is established. The three-dimensional dynamic governing equation of unsaturated soil was simplified by using Novak's thin-layer theory. After solving the vibration impedance factor of unsaturated soil, combined with the boundary conditions of pile and soil, the vibration balance equation of the pile was solved, and the expressions of the complex stiffness at the pile top and the internal force of the pile were obtained. The correctness of the model and solution is verified by comparison calculation, and the influence of relevant parameters on the dynamic characteristics of pile foundation are discussed. The results show that the dynamic stiffness factor increases with the increase of frequency, while the damping factor remains unchanged. The saturation degree has little effect on the stiffness factor and the damping factor, which decreases as the saturation degree increases. The pile-to-soil modulus ratio has a significant effect on dynamic behaviors of pile in unsaturated soil. With the increase of the pile-to-soil modulus ratio, the amplitude of the complex stiffness of pile top and the frequency interval corresponding to the peak value gradually increase. Permeability has little effect on the complex stiffness of pile top. Under different excitation frequencies, the internal force and displacement of the pile shaft vary significantly, and the greater the frequency, the greater the peak value of the displacement and internal force amplitude of the pile shaft.

     

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