Wall and Ground Movements due to Deep Excavations in Shanghai Soft Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 7
Abstract
An extensive database of 300 case histories of wall displacements and ground settlements due to deep excavations in Shanghai soft soils were collected and analyzed. The mean values of the maximum lateral displacements of walls constructed by the top-down method, walls constructed by the bottom-up method (including diaphragm walls, contiguous pile walls, and compound deep soil mixing walls), sheet pile walls, compound soil nail walls, and deep soil mixing walls are , , , , and , respectively, where is the excavation depth. The mean value of the maximum ground surface settlement is . The settlement influence zone reaches to a distance of about to from the excavation. The ratio between the maximum ground surface settlement and the maximum lateral displacement of a wall generally ranges from 0.4 to 2.0, with an average value of 0.9. The factors affecting the deformation of the wall were analyzed. It shows that there is a slight evidence of a trend for decreasing wall displacement with increasing system stiffness and the factor of safety against basal heave. Wall and ground movements were also compared with that observed in worldwide case histories.
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Acknowledgments
The writers wish to gratefully acknowledge the financial support from National Natural Science Foundation of China (Grant No. NNSFC50679041), the Science and Technology Commission of Shanghai Municipality (Grant No. UNSPECIFIED08201200901), and the Shanghai Leading Academic Discipline Project (Grant No. UNSPECIFIEDB208). The writers would like to thank the reviewers for their concrete suggestions for improving this paper.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 136 • Issue 7 • July 2010
Pages: 985 - 994
Copyright
© 2010 ASCE.
History
Received: Mar 2, 2008
Accepted: Dec 1, 2009
Published online: Dec 4, 2009
Published in print: Jul 2010
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