Performance of composite foundations with different load transfer platforms and substratum stiffness over silty clay

The semi-rigid pile-supported composite foundation is widely used in highway projects due to its effectiveness in increasing the bearing capacity and stability of foundations. It is crucial to understand the stress distribution across the embankment width and the behaviour of unreinforced foundation...

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Bibliographic Details
Published in:Journal of mountain science 2024, Vol.21 (5), p.1761-1774
Main Authors: Zhang, Shuming, Liu, Yan, Yuan, Shengyang, Liu, Xianfeng, Jiang, Guanlu, Liu, Junyan
Format: Article
Language:English
Subjects:
Axial forces
Bearing capacity
Centrifuges
Comparative analysis
Deformation
Earth and Environmental Science
Earth Sciences
Ecology
Embankments
End bearing piles
Environment
Foundations
Geography
Geosynthetics
Load transfer
Measuring instruments
Original Article
Piles
Soil stresses
Stiffness
Stress distribution
Stress ratio
Substrata
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Summary:The semi-rigid pile-supported composite foundation is widely used in highway projects due to its effectiveness in increasing the bearing capacity and stability of foundations. It is crucial to understand the stress distribution across the embankment width and the behaviour of unreinforced foundations. Thus, five centrifuge tests were conducted to examine the bearing and deformation behaviours of NPRS (Non-Connected Piled Raft Systems) and GRPS (Geosynthetic-Reinforced Pile-Supported systems) with varying substratum stiffness, then a comparative analysis was conducted on embankment settlement, pressures underneath the embankments, and axial forces along the piles. The results indicated that greater substratum stiffness correlates with reduced settlement and deformation at various depths. Deformation occurring 5 meters from the embankment toe includes settlement in NPRS and upward movement in GRPS. The potential sliding surface is primarily located within the embankment in NPRS, whereas it may extend through both the embankment and foundation in GRPS. The pile-soil stress ratio and efficiency in NPRS are higher than in GRPS across the embankment. The axial force borne by end-bearing piles is significantly greater than that by floating piles. As the buried depth increases, the axial force in GRPS initially rises then declines, whereas in NPRS, it remains relatively constant within a certain range before decreasing. This study aids in assessing the applicability of composite foundations in complex railway environments and provides a reference for procedural measures under similar conditions.
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-023-8489-4