Simplified Model for Wall Deflection and Ground-Surface Settlement Caused by Braced Excavation in Clays
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 6
Abstract
Accurate prediction of ground-surface settlement adjacent to an excavation is often difficult to achieve without using accurate representation of small-strain nonlinearity in a soil model within finite-element analyses. In this paper a simplified semiempirical model is proposed for predicting maximum wall deflection, maximum surface settlement, and surface-settlement profile due to excavations in soft to medium clays. A large number of artificial data are generated through finite-element analyses using a well-calibrated, small-strain soil model. These data, consisting of wall displacements and ground-surface settlements in simulated excavations in soft to medium clays, provide the basis for developing the proposed semiempirical model. The proposed model is verified using case histories not used in the development of the model. The study shows that the developed model can accurately predict maximum wall deflection and ground-surface settlement caused by braced excavations in soft to medium clays.
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Acknowledgments
The study on which this paper is based was supported by the National Science Foundation through Grant No. CMS-0300198 under program director Dr. Richard J. Fragaszy. This financial support is greatly appreciated. The results and opinions expressed in this paper are those of the writers and do not necessarily represent the view of the National Science Foundation. The finite-element computer code used in this study was provided by Professor Pio-Go Hsieh. The writers wish to acknowledge the assistance provided by Professor Chang-Yu Ou and Professor Pio-Go Hsieh in the course of this study. However, the writers are solely responsible for the results and opinions presented in this paper.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 6 • June 2007
Pages: 731 - 747
Copyright
© 2007 ASCE.
History
Received: May 2, 2006
Accepted: Oct 30, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
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