Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

Yuan TU, M.H. El NAGGAR, Kuihua WANG, Wenbing WU, Juntao WU

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PDF(16213 KB)
Front. Struct. Civ. Eng. ›› 2023, Vol. 17 ›› Issue (6) : 915-934. DOI: 10.1007/s11709-023-0907-8
RESEARCH ARTICLE
RESEARCH ARTICLE

Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

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Abstract

A fictitious soil pile (FSP) model is developed to simulate the behavior of pipe piles with soil plugs undergoing high-strain dynamic impact loading. The developed model simulates the base soil with a fictitious hollow pile fully filled with a soil plug extending at a cone angle from the pile toe to the bedrock. The friction on the outside and inside of the pile walls is distinguished using different shaft models, and the propagation of stress waves in the base soil and soil plug is considered. The motions of the pile−soil system are solved by discretizing them into spring-mass model based on the finite difference method. Comparisons of the predictions of the proposed model and conventional numerical models, as well as measurements for pipe piles in field tests subjected to impact loading, validate the accuracy of the proposed model. A parametric analysis is conducted to illustrate the influence of the model parameters on the pile dynamic response. Finally, the effective length of the FSP is proposed to approximate the affected soil zone below the pipe pile toe, and some guidance is provided for the selection of the model parameters.

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Keywords

fictitious soil pile / soil plug / pipe piles / high-strain dynamic analysis / one-dimensional wave theory / pile dynamics

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Yuan TU, M.H. El NAGGAR, Kuihua WANG, Wenbing WU, Juntao WU. Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions. Front. Struct. Civ. Eng., 2023, 17(6): 915‒934 https://doi.org/10.1007/s11709-023-0907-8

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Acknowledgements

This work was supported by the Key Project of Natural Science Foundation of Zhejiang Province (No. LXZ22E080001), National Natural Science Foundation of China (Grant Nos. 51779217, 52178358, and 52108349), and China Scholarship Council (No. 202006320262). We gratefully acknowledge this support.

Conflict of Interest

The authors declare that they have no conflict of interest.

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2023 Higher Education Press
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