Centrifuge Tests on Rock-Socketed Piles: Effect of Socket Roughness on Shaft Resistance
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 11
Abstract
Preliminary estimations of shaft resistance of rock-socketed piles are usually conducted using empirical formulations that relate to the uniaxial compressive strength () of the weaker material involved (intact rock or pile). However, there are other factors, such as the degree of socket roughness, that could affect the shaft resistance of rock-socketed piles. In this paper, results from geotechnical centrifuge tests are presented to demonstrate the effect of socket roughness on the pile shaft resistance. Aluminum model piles with different degrees of shaft roughness were fabricated and embedded within an artificial rock mixture composed of sand, cement, bentonite, and water. Pile loading tests were conducted within the centrifuge and axial forces along the model piles were measured using fiber Bragg grating (FBG) sensing technology. Results are used to demonstrate that centrifuge testing provides a suitable experimental method to study and quantify the effect of socket roughness on the shaft shearing mechanism of rock-socketed piles. Finally, the centrifuge test measurements are compared with several formulations published in the literature, suggesting that centrifuge measurements tend to agree with the overall trend, despite the variability of predictions obtained with different formulations.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (centrifuge test results).
Acknowledgments
This research was funded, in part, by the Spanish Ministries of Economy, Industry and Competitiveness and Science and Innovation under Projects BIA 2015-69152-R and PID2019-108060RB-I00. The first author was the recipient during 2019 of one Fellowship for PhD research provided by the José Entrecanales Ibarra Foundation. The support of both institutions is gratefully acknowledged.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 11 • November 2021
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© 2021 American Society of Civil Engineers.
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Received: May 21, 2020
Accepted: Jul 7, 2021
Published online: Aug 31, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 31, 2022
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