Vertical dynamic analysis of the pile in unsaturated soils based on COMSOL

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 46-52.

YE Zi1,2，CHEN Yonghui1,2，KONG Gangqiang1,2，CHEN Geng1,2，XU Jie1,2，HU Nan1,2

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Abstract

The groundwater level determines that there is a large number of unsaturated soils on the soil surface, and its dynamic characteristics are significantly different from those of saturated medium or single-phase medium. As the main medium interacting with piles, unsaturated media have a critical effect on the dynamic behavior of piles. In this paper, considering the unsaturated characteristics of the soil around a dynamically loaded pile, based on the wave equation of the unsaturated poroelastic medium, the motion equation of the pile and the boundary condition, the Partial Differential Equation module in COMSOL Multiphysics software is used to establish a dynamic mathematical model of the interaction between the pile and the unsaturated soil with complex characteristics, such as stratification, transverse isotropy, inhomogeneity and so on. Meanwhile, several complex characteristics of soils and piles can also be reflected in this model. After verifying the correctness of the COMSOL model by comparing with the existing literature, a series of numerical examples were designed to discuss the influence of factors such as the soil saturation and inhomogeneity on the vertical dynamic impedance of a pile.

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unsaturated soils / single piles / dynamic impedance / COMSOL

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YE Zi1,2，CHEN Yonghui1,2，KONG Gangqiang1,2，CHEN Geng1,2，XU Jie1,2，HU Nan1,2. Vertical dynamic analysis of the pile in unsaturated soils based on COMSOL[J]. Journal of Vibration and Shock, 2024, 43(12): 46-52

References

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