Numerical Study of Bearing Capacity of the Pile-Supported Embankments for the Flexible Floating, Rigid Floating and End-Bearing Piles

Floating pile-supported embankment involves more complex load transfer mechanisms, and there are no clear uniform guidelines available for its design. The concepts of flexible floating, rigid floating and end-bearing pile-supported embankments were proposed in this paper. Based on three typical fiel...

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Bibliographic Details
Published in:Symmetry (Basel) 2022-10, Vol.14 (10), p.1981
Main Authors: Hu, Shunlei, Zhuang, Yan, Wu, Yifan, Zhang, Xidong, Dong, Xiaoqiang
Format: Article
Language:English
Subjects:
Coefficients
Earth pressure
Embankments
End bearing piles
end-bearing pile
Finite element method
flexible floating pile
Investigations
Load
Load transfer
Mathematical analysis
Pile bearing capacities
pile-supported embankments
rigid floating pile
Skin friction
soil arching
Soil-pile interaction
Soils
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Summary:Floating pile-supported embankment involves more complex load transfer mechanisms, and there are no clear uniform guidelines available for its design. The concepts of flexible floating, rigid floating and end-bearing pile-supported embankments were proposed in this paper. Based on three typical field cases, their pile-soil interactions and soil arching effect were examined using the three-dimensional finite element method. Due to symmetry, only a half-width embankment model was simulated here. It has been found that the flexible floating piles carry the load mainly relying on the skin friction, but end-bearing piles rely on the pile tip resistance. The rigid floating piles were somehow in between. The earth pressure coefficient (K) in the end-bearing pile-supported embankment reached a maximum of 3.28, greater than Rankine passive values of the earth pressure coefficient (KP), in which the soil arching was fully developed. The K in the embankment with rigid floating pile reached 2.21, where soil arching might be partially formed. At the bottom of the flexible floating pile-supported embankment, the K tended to equal the Rankine active values of the earth pressure coefficient (Ka), and thus soil arching was insignificant. It has also been found that using rigid floating piles might significantly improve the bearing capacity of the embankments and was cost-effective for deep soft soil areas.
ISSN:2073-8994
2073-8994
DOI:10.3390/sym14101981