Pile Behavior due to Excavation-Induced Soil Movement in Clay. I: Stable Wall
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Volume 132, Issue 1
Abstract
A series of centrifuge model tests has been conducted to investigate the behavior of a single pile subjected to excavation-induced soil movements behind a stable retaining wall in clay. The results reveal that after the completion of soil excavation, the wall and the soil continue to move and such movement induces further bending moment and deflection on an adjacent pile. For a pile located within behind the wall where the soil experiences large shear strain due to stress relief as a result of the excavation, the induced pile bending moment and deflection reach their maximum values sometime after soil excavation and thereafter decrease slightly with time. For a pile located beyond the wall, the induced pile bending moment and deflection continue to increase slightly with time after excavation until the end of the test. A numerical model developed at the National University of Singapore is used to back-analyze the centrifuge test data. The method gives a reasonably good prediction of the induced bending moment and deflection on a pile located at or beyond the wall. For a pile located at behind the wall where the soil experiences large shear strain due to stress relief resulting from the excavation, the calculated pile response is in good agreement with the measured data if the correct soil shear strength obtained from postexcavation is used in the analysis. However, if the original soil shear strength prior to excavation is used in the analysis, this leads to an overestimation of the maximum bending moment of about 25%. The practical implications of the findings are also discussed in this paper.
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Acknowledgments
The writers wish to acknowledge the help rendered by the laboratory personnel in the Geotechnical Centrifuge Laboratory of the National University of Singapore for their able and kind assistance in conducting the centrifuge tests for the present study.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 1 • January 2006
Pages: 36 - 44
Copyright
© 2006 ASCE.
History
Received: Mar 17, 2004
Accepted: Apr 12, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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