Shaft Friction Characteristics of Two FRP Seawater Sea–Sand Concrete Piles in a Rock Socket with or without Debris
Publication: International Journal of Geomechanics
Volume 21, Issue 7
Abstract
The existence of debris at the bottom of a rock socket significantly influences the mechanical behavior of a rock-socketed pile. To investigate the effects of debris on shaft friction and load transfer characteristics of a rock-socketed fiber–reinforced polymer (FRP) seawater sea–sand concrete (SSC) pile, two physical model tests will be conducted in this study. Cyclic and monotonic loadings will be applied on the top of FRP–SSC model piles along the axial direction. The vertical strains inside the model piles will be monitored by embedded fiber Bragg grating (FBG) sensors, which will be used to calculate axial stress inside the pile and shaft friction at the pile–rock interface. From the monitoring results, the detailed distribution of load transfer and shaft friction in each model pile is obtained. A comparison of the results from the two model pile tests indicates that the shaft friction and the end-bearing stress were significantly influenced by debris at the bottom of the rock socket. Under cyclic loading and static loading, the mobilization of shaft friction is more dominant when debris existed than when it does not. The end-bearing stress was reduced due to the existence of debris.
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Acknowledgments
The work in this study was supported by a Theme-based Research Scheme project (T22-502/18-R), a Research Impact Fund project (R5037-18) and two GRF projects (PolyU 152796/16E, PolyU 152209/17E) from the Research Grants Council of Hong Kong Special Administrative Region Government of China. The authors also acknowledge the financial supports from the Research Institute for Sustainable Urban Development of The Hong Kong Polytechnic University and a grant (ZDBS) from The Hong Kong Polytechnic University.
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Information
Published In
International Journal of Geomechanics
Volume 21 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 26, 2020
Accepted: Feb 9, 2021
Published online: Apr 20, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 20, 2021
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