Dynamic response of a large-diameter end-bearing pile in permafrost

• Published in: Scientific Reports
• Main Authors: Qiang Li, Yongyuan Zhang, Chen Chen, Minjie Wen, Wenjie Guan, Weiwei Duan
• Format: Article in Journal/Newspaper
• Language: English
• Published: Nature Portfolio 2024
• Subjects: Medicine; R; Science; Q; permafrost
• Online Access: https://doi.org/10.1038/s41598-023-46639-2; https://doaj.org/article/ce121db4648b4be4802089e3b1981502

Abstract Vertically dynamic model of a large-diameter pile in frozen soil is established, in which the frozen soil is described to a saturated frozen porous media, and the large diameter end-bearing pile is simplified to a one-dimensional rod considering the influence of the transverse inertia effect. Analytical solutions of the longitudinal coupling vibration between the end-bearing pile and the frozen soil are obtained using Helmholtz decomposition and variable separation methods in the frequency domain. By comparing the dynamic responses of the longitudinal vibration of the large diameter end-bearing pile with the traditionally one-dimensional pile, as well as the impedance factor of the frozen soil layer induced by the pile vibration, these demonstrate the influence of the transverse inertia effect on the high frequency vibration of large diameter pile is significant, and the influence on the pile with a smaller slenderness ratio is larger. The temperature and the Poisson’s ratio also have significant effects on the vertical vibration of large diameter piles in frozen soil, which cannot be ignored in the analysis.