Effects of Separation on the Behavior of Soil-Pile Interaction in Liquefiable Soils
Publication: International Journal of Geomechanics
Volume 12, Issue 1
Abstract
Separation and sliding between soil and pile have a significant effect on the complex behavior of pile groups under dynamic condition. In addition to separation between soil and pile, the behavior of soil medium surrounding the piles is nonlinear during strong excitations. Therefore, soil is modeled using a nonlinear work-hardening plastic cap model. Because of shaking, there is an increase in pore water pressure. To simulate it, the pore-pressure generation capability is added in modeling the behavior of the soil medium. A full three-dimensional finite-element soil-pile model has been developed with approximate radiation condition at infinity simulated by frequency dependent Kelvin elements. The model and the process of computation have been verified with the established literature. The effects of separation on the dynamic stiffness and seismic response of single pile and pile groups have been examined considering work-hardening soil-plasticity without and with pore-pressure generation capability for a wide range of frequencies of excitation. Real-time earthquake motions are also applied and the effects of separation on the responses of pile groups are investigated. Significant effects of separation of the soil medium on the response of the soil-pile system have been observed and approximately quantified.
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Acknowledgments
The research presented here is supported by Department of Science and Technology, Govt. of India under Project Grant No. UNSPECIFIEDSR/S3/MERC/31/2005. This support is gratefully acknowledged. Authors would like to thank Prof. and Head, Dept. of Earthquake Engineering for extending every possible help for smooth conduct of the research.
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Published In
International Journal of Geomechanics
Volume 12 • Issue 1 • February 2012
Pages: 1 - 13
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Sep 10, 2009
Accepted: Oct 24, 2010
Published online: Jan 17, 2012
Published in print: Feb 1, 2012
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