Elasto-plastic variational solution for vertically loaded noncylindrical piles

LI Xiancheng; ZHOU Hang; QI Geping

doi:10.11779/CJGE20211472

Volume 45 Issue 1

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Chinese Journal of Geotechnical Engineering > 2023 > 45(1): 122-133. > DOI: 10.11779/CJGE20211472

LI Xiancheng, ZHOU Hang, QI Geping. Elasto-plastic variational solution for vertically loaded noncylindrical piles[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(1): 122-133. DOI: 10.11779/CJGE20211472

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Elasto-plastic variational solution for vertically loaded noncylindrical piles

LI Xiancheng^{1, 2,},
ZHOU Hang^{1, 2, ,},
QI Geping^{1, 2}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China

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Received Date: December 10, 2021
Available Online: February 03, 2023
Published Date: December 10, 2021

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Abstract

Abstract

The existing analytical or semi-analytical methods cannot rigorously capture the geometrical effects of noncylindrical piles in elasto-plastic soils. To solve this issue, based on the principle of virtual work, the governing equations for the pile-soil system are derived. Solving the governing equation with a complex boundary is overcome by the conformal mapping technique. A semi-analytical algorithm for the vertically loaded noncylindrical piles in elasto-plastic soils is developed by combing the use of integral algorithm for the hyperbolic D-P constitutive model. A general theoretical model for the load transfer of the vertically loaded noncylindrical piles considering the geometrical effects is proposed. The reliability and efficiency of the proposed semi-analytical method is validated by comparing the predicted results with those of FEM. Finally, detailed parametric studies are conducted to investigate the geometrical effects on the influences of load-settlement curve. It is found that the non-circular cross-section has insignificant influences on the settlement of the pile head under working loads, which principally affects the magnitude of the ultimate bearing capacity of the pile.
- elasto-plastic soil,
- noncylindrical pile,
- principle of virtual work,
- conformal mapping,
- D-P constitutive model,
- load transfer

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Elasto-plastic variational solution for vertically loaded noncylindrical piles

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