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<p>In the present study, the scaling law was used to model a large-scale prototype pile foundation based on the flexural rigidity method under machine-based axial harmonic excitations. Axial excitation tests were performed on model piles on different sets of soil-pile combinations. The measured dynamic field response curves (frequency versus amplitude) of all soil-pile combinations indicate the non-linear characteristics of combined soil-pile systems. The dynamic responses of the scaled prototype piles were determined by scaling factors of 4, 6, and 8, which scale the pile lengths to 12.0&#xa0;m, 18.0&#xa0;m, and 24.0&#xa0;m, respectively, while keeping the same aspect ratio. Using the parameters of the scaled prototype systems, theoretical analysis was performed by the continuum approach method to measure the responses with impedance parameters of the scaled prototype systems. It was found from the scaled and theoretically predicted prototype pile responses that the resonant frequency values were decreased and the resonant amplitudes were increased as compared to the model soil-pile systems. It was also observed that the predicted axial stiffness and damping of all soil-pile systems decrease by approximately 26%-33% and 71%-82%, respectively, within the operating frequency range for both model and prototype systems.</p>

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Dynamic Characteristics of Model and Full-Scaled Prototype Piles under Machine-based Axial Harmonic Excitation

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Surya Prakash Sharma,
  • Shiva Shankar Choudhary

摘要

In the present study, the scaling law was used to model a large-scale prototype pile foundation based on the flexural rigidity method under machine-based axial harmonic excitations. Axial excitation tests were performed on model piles on different sets of soil-pile combinations. The measured dynamic field response curves (frequency versus amplitude) of all soil-pile combinations indicate the non-linear characteristics of combined soil-pile systems. The dynamic responses of the scaled prototype piles were determined by scaling factors of 4, 6, and 8, which scale the pile lengths to 12.0 m, 18.0 m, and 24.0 m, respectively, while keeping the same aspect ratio. Using the parameters of the scaled prototype systems, theoretical analysis was performed by the continuum approach method to measure the responses with impedance parameters of the scaled prototype systems. It was found from the scaled and theoretically predicted prototype pile responses that the resonant frequency values were decreased and the resonant amplitudes were increased as compared to the model soil-pile systems. It was also observed that the predicted axial stiffness and damping of all soil-pile systems decrease by approximately 26%-33% and 71%-82%, respectively, within the operating frequency range for both model and prototype systems.