Abstract
The paper presents the evolution of the bearing capacity of a pile model in calibration chamber after the application of a cyclic axial loading at a large number of cycles. This work is a part of the French research project ANR-SOLCYP which aims to understand the mechanisms governing the evolution of the bearing capacity of piles up to a very large number of cycles (105 cycles). The experimental study consists in using a calibration chamber in which axial cyclic loading is applied to pile model jacked into sand under a large number of cycles, up to 105, while measuring the axial shaft capacity before and after the cyclic sequence. Some key parameters have been investigated such as the cyclic displacement amplitude, the level of applied consolidation stress and the density index of the soil. It was found that after a large number of cycles of cyclic axial loading, the post-cyclic bearing capacity of the piles is significantly improved. Results analysis indicated that the mechanism of densification of the soil around the pile led to improve pile capacity.
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Abbreviations
- d :
-
Probe/pile diameter
- D :
-
Calibration chamber diameter
- I D :
-
Density index
- f :
-
Loading frequency
- N :
-
Number of cycles
- ρ c :
-
Cyclic displacement amplitude
- σ'v :
-
Vertical effective stress
- σ'h :
-
Horizontal effective stress
- f s :
-
Skin friction (local friction)
- q p :
-
Tip resistance
- D τ ,peak :
-
Global evolution factor of skin friction at the peak
- D τ :
-
Global evolution factor of limit skin friction
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Acknowledgements
The work presented in this paper was undertaken in the UR—Navier laboratory of the ENPC; within the scope of the research project SOLCYP (CYclic SOLicitations applied to Piles) managed by IREX (Institute for applied Research and EXperimentation in civil engineering). The authors acknowledge the support provided by the laboratory and the assistance of the technical team. The authors would like to thank the referees for their valuable comments which helped to improve the manuscript.
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Bekki, H., Tali, B., Canou, J. et al. Effect of cyclic loading at a large number of cycles on the bearing capacity of piles in sand. Acta Geotech. 19, 591–604 (2024). https://doi.org/10.1007/s11440-023-02093-y
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DOI: https://doi.org/10.1007/s11440-023-02093-y