Model tests and theoretical analysis of the vertical vibration of a single pile in saturated sandy soil

Abstract

The study of vibration dynamic response of pile foundation has critical applications for seismic structure design. In this paper, firstly, the vibration characteristics of single pile with different length to diameter ratios under different vibration frequency loads were studied by the foundation pile model test method. Moreover, the amplitude-frequency curves of single pile vibration are plotted by using Fourier transform. Then the theoretical model of the pile-soil-cap system under sinusoidal periodic vibration load is established by using saturated porous medium theory, and the amplitude and frequency curves are obtained. Numerical results show that the theoretical solution can be in good agreement with the experimental results, which verifies the validation of the theoretical model. Furthermore, the resonant frequency is proven to be negatively related to the length to diameter ratio of the pile under the same pile diameter.