Centrifuge Modeling of Large-Diameter Bored Pile Groups with Defects
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 9
Abstract
In this research, centrifuge model pile-load tests were carried out to failure to investigate the behavior of large-diameter bored pile groups with defects. The model piles represented cast-in-place concrete piles in diameter and in length. Two series of static loading tests were performed. The first series of tests simulated the performance of a pile founded on rock and a pile with a soft toe. The second series of tests simulated the performance of three pile groups: One reference group without defects, one group containing soft toes, and one group with two shorter piles not founded on rock. The presence of soft toes and shorter piles in the defective pile groups considerably reduced the pile group stiffness and capacity. As the defective piles were less stiff than the piles without defects, the settlements of the individual piles in the two defective pile groups were different. As a result, the applied load was largely shared by the piles without defects, and the defective pile groups tilted significantly. The rotation of the defective pile groups caused large bending moments to develop in the group piles and the pile caps. When the applied load was large, bending failure mechanisms were induced even though the applied load was vertical and concentric. The test results confirm findings from numerical analyses in the literature.
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Acknowledgments
This research was substantially supported by grants from the Research Grants Council of Hong Kong (Project Nos. HKUST6035/02E and HKUST6126/03E). The writers would like to acknowledge the assistance of Andy Chan in conducting the centrifuge tests.
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© 2007 ASCE.
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Received: Mar 8, 2005
Accepted: Dec 21, 2006
Published online: Sep 1, 2007
Published in print: Sep 2007
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