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Published in:
2025 | OriginalPaper | Chapter
Influences of Water Saturation on Dynamic Responses of Unsaturated Ground Subjected to a Single Moving Load
Authors : Linlian Jin, Liqun Zeng, Jing Hu
Published in: Proceedings of the 5th International Conference on Transportation Geotechnics (ICTG) 2024, Volume 5
Publisher: Springer Nature Singapore
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Abstract
To investigate the influences of water saturation on dynamic responses in the unsaturated ground under moving load, this study derives Biot form governing equations for a three-phase unsaturated medium that can be easily solved using the solution framework of a single-phase or double-phase medium. The governing equations are solved via two-and-half dimensional finite element method (2.5D FE method). A 2.5D FE model of embankment-unsaturated ground system with the consideration of node’s 9 DOFs (degree of freedoms) is established. Through the numerical analysis, it is found that when the load speed is during 0.5 \({V}_{C}^{min}\) to \({V}_{C}^{min}\) (\({V}_{C}^{min}\) is critical velocity of 100% saturated soil), the displacement responses at the embankment surface are independent of the load speed and only determined by the product of load speed and water saturation cSr. When the load speed \(<\) 0.5 \({V}_{C}^{min}\), the displacement response amplitudes are independent of the load speed, mainly determined by the water saturation.