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Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration
Composite pile foundation has been widely used in ground engineering. This composite pile foundation system has complex pile-soil interactions under seismic loading. The calculation of vertical bearing capacity of composite pile foundation is still an unsolved problem if the soil around piles is par...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7968676/ https://www.ncbi.nlm.nih.gov/pubmed/33730066 http://dx.doi.org/10.1371/journal.pone.0248502 |
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author | Zhan-fang, Huang Bai, Xiao-hong Yin, Chao Liu, Yong-qiang |
author_facet | Zhan-fang, Huang Bai, Xiao-hong Yin, Chao Liu, Yong-qiang |
author_sort | Zhan-fang, Huang |
collection | PubMed |
description | Composite pile foundation has been widely used in ground engineering. This composite pile foundation system has complex pile-soil interactions under seismic loading. The calculation of vertical bearing capacity of composite pile foundation is still an unsolved problem if the soil around piles is partially or completely liquefied under seismic loading. We have completed indoor shaking table model tests to measure the vertical bearing capacity in a liquefiable soil foundation under seismic loading. This paper will use a numerical approach to analyze the change of this vertical bearing capacity under seismic loading. Firstly, the Goodman contact element is improved to include the Rayleigh damping. Such an improvement can well describe the reflection and absorption of seismic waves at the interface of soil and piles. Secondly, the Biot’s dynamic consolidation theory incorporated an elastoplastic model is applied to simulate the soil deformation and the generation and accumulation of pore water pressure under seismic loading. Thirdly, after verification with our indoor shaking table test data, this approach is used to investigate the effects of pile spacing on liquefaction resistance of the composite pile foundation in liquefiable soil. The time histories of pore water pressure ratio (PPR′) are calculated for the liquefiable soil and the vertical bearing capacity in partially liquefied soil is calculated and compared with our indoor shaking table test data at the 3D, 3.5D, 4D, 5D and 6D cases (D is the pile diameter). It is found that the pile spacing has some influence on the extent of soil liquefaction between piles. The vertical bearing capacity varies with liquefaction extent of inter-pile soil. The optimization of pile spacing varies with liquefaction extent. These results may provide some reference for the design of composite pile foundation under seismic loading. |
format | Online Article Text |
id | pubmed-7968676 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-79686762021-03-31 Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration Zhan-fang, Huang Bai, Xiao-hong Yin, Chao Liu, Yong-qiang PLoS One Research Article Composite pile foundation has been widely used in ground engineering. This composite pile foundation system has complex pile-soil interactions under seismic loading. The calculation of vertical bearing capacity of composite pile foundation is still an unsolved problem if the soil around piles is partially or completely liquefied under seismic loading. We have completed indoor shaking table model tests to measure the vertical bearing capacity in a liquefiable soil foundation under seismic loading. This paper will use a numerical approach to analyze the change of this vertical bearing capacity under seismic loading. Firstly, the Goodman contact element is improved to include the Rayleigh damping. Such an improvement can well describe the reflection and absorption of seismic waves at the interface of soil and piles. Secondly, the Biot’s dynamic consolidation theory incorporated an elastoplastic model is applied to simulate the soil deformation and the generation and accumulation of pore water pressure under seismic loading. Thirdly, after verification with our indoor shaking table test data, this approach is used to investigate the effects of pile spacing on liquefaction resistance of the composite pile foundation in liquefiable soil. The time histories of pore water pressure ratio (PPR′) are calculated for the liquefiable soil and the vertical bearing capacity in partially liquefied soil is calculated and compared with our indoor shaking table test data at the 3D, 3.5D, 4D, 5D and 6D cases (D is the pile diameter). It is found that the pile spacing has some influence on the extent of soil liquefaction between piles. The vertical bearing capacity varies with liquefaction extent of inter-pile soil. The optimization of pile spacing varies with liquefaction extent. These results may provide some reference for the design of composite pile foundation under seismic loading. Public Library of Science 2021-03-17 /pmc/articles/PMC7968676/ /pubmed/33730066 http://dx.doi.org/10.1371/journal.pone.0248502 Text en © 2021 Zhan-fang et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Zhan-fang, Huang Bai, Xiao-hong Yin, Chao Liu, Yong-qiang Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title | Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title_full | Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title_fullStr | Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title_full_unstemmed | Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title_short | Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
title_sort | numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7968676/ https://www.ncbi.nlm.nih.gov/pubmed/33730066 http://dx.doi.org/10.1371/journal.pone.0248502 |
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