Stability of Footings Adjacent to Pile Walls
Publication: International Journal of Geomechanics
Volume 15, Issue 6
Abstract
The stability of a footing may be destabilized near a retaining wall because of increased lateral displacement and decreased soil confining pressure. The stability of footing within this footing–soil–wall system is complex and not predicted using the classical solutions utilized for a semi-infinite footing–soil system. In this study, the bearing capacity of a concrete footing placed near a wall of spaced driven concrete piles using three-dimensional finite-element (FE) analysis with ANSYS 13.0 is investigated. All system materials are idealized as nonlinear, elastic–perfectly plastic, and rate independent using the upper bound function of the Drucker–Prager yield criterion. Three different soil deposits are studied: kaolin, silty clay, and kaolin–sand. A total of 144 unique FE analysis runs are executed. The footing bearing capacity is computed from the output footing pressure–settlement curve using several well-known postprocessing linearization criteria from which the lowest value is chosen. Soil yielding patterns and failure mechanisms are also studied and presented. Empirical equations capable of predicting the footing bearing capacity and the footing–pile distance without the effect of destabilizing factors are developed.
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Acknowledgments
The first author thanks Ms. Niki Contreras for providing assistance in editing this paper. Also, the authors extend their deepest thanks to the reviewers and editor for their valuable advice.
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Published In
International Journal of Geomechanics
Volume 15 • Issue 6 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 4, 2014
Accepted: Dec 5, 2014
Published online: Apr 14, 2015
Discussion open until: Sep 14, 2015
Published in print: Dec 1, 2015
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