Centrifuge Tests of Superlarge-Diameter Rock-Socketed Piles and Their Bearing Characteristics
Publication: Journal of Bridge Engineering
Volume 19, Issue 6
Abstract
To understand the mechanical properties of superlarge-diameter piles in complicated geologic conditions, the authors carried out centrifuge model tests that simulated the bearing characteristics of single rock-socketed piles that had different cover thicknesses and rock-socket lengths. Valuable results were obtained from the centrifuge model tests. The overlying stratum of a single superlarge-diameter rock-socketed pile shares a certain proportion of the upper load, so it is not wise to neglect its bearing capacity in this type of design. The shaft resistance and tip resistance did not work synchronously with an increase in the upper load. Shaft resistance was mobilized prior to tip resistance and carried the majority of the upper load when the rock-socket length exceeded three times the pile diameter. There is an optimal rock-socket length for a certain thickness of overlying stratum. A centrifuge test was performed to investigate the behavior of a pile group socketed in bedrock with an inclined surface. The load distribution in the pile group was not even, and piles that had longer rock-socket lengths shared more load than piles that had shorter rock-socket lengths. The inclined surface caused differential settlement under concentrated vertical loading, which might result in safety issues with the superstructure.
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Acknowledgments
Both the National Natural Science Foundation of China (Grant Nos. 41272292 and 41172247) and the Guizhou Provincial DOT (Project No. 2010-122) funded this research project. The research was also substantially supported by the Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education. Their support is gratefully acknowledged. The authors thank Mr. Xin An and Associate Professor Xianfeng Ma of Tongji University for conducting the centrifuge tests.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 19 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 21, 2013
Accepted: Nov 7, 2013
Published online: Jan 9, 2014
Published in print: Jun 1, 2014
Discussion open until: Jun 9, 2014
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