Observed Performance of a Deep Multistrutted Excavation in Shanghai Soft Clays
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Volume 131, Issue 8
Abstract
A 15.5 m deep multistrutted soft clay excavation of a metro station in Shanghai has been monitored. The deep excavation was supported by a concrete diaphragm wall. The monitoring included wall deflections, surface and subsurface ground settlements, total pressures, and pore-water pressures. Relatively small wall deflections and ground settlements were measured as compared with similar case histories worldwide. The small deflections and settlements observed probably occurred because of the use of a short excavation section, application of compaction grouting for improving ground conditions, and the use of active prestress steel struts. No significant “creep” deflection of the diaphragm wall could be identified over a 60 day concrete curing period. Continuous ground settlements accompanied by the dissipation of pore-water pressures were observed. By using Terzaghi’s one-dimensional consolidation theory, the observed settlements were found to be attributed to the primary consolidation rather than creep effects.
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Acknowledgments
The writers would like to thank the National Natural Science Foundation of China (Grant No. UNSPECIFIED10102015), the Research Grants Council of the HKSAR (Grant No. UNSPECIFIEDHKUST6025/01E), and HKUST (Grant No. UNSPECIFIEDDAG02/03.EG15) for providing financial support of this research work.
References
Bjerrum, L., and Eide, O. (1956). “Stability of strutted excavations in clay.” Geotechnique, 6(1), 32–47.
Clough, G. W., and O’Rourke, T. D. (1990). “Construction induced movements of in situ walls.” Proc., ASCE Conf. on Des. and Perf. of Earth Retaining Struct., Geotech. Spec. Publ. No. 25, ASCE, New York, 439–470.
Clough, G. W., and Reed, M. W. (1984). “Measured behavior of braced wall in very soft clay.” J. Geotech. Eng., 110(1), 1–19.
Finno, R. J., Atmatzidis, D. K., and Perkins, S. B. (1989a). “Observed performance of a deep excavation in clay.” J. Geotech. Eng., 115(8), 1045–1064.
Finno, R. J., and Nerby, S. M. (1989b). “Saturated clay response during braced cut construction.” J. Geotech. Eng., 115(8), 1065–1084.
Lings, M. L., Ng, C. W. W., and Nash, D. F. T. (1994). “The pressure of wet concrete in diaphragm wall panels cast under bentonite.” Proc., of the Institution of Civil Engineers, United Kingdom, Vol. 107, 163–172.
Liu, J. H., and Hou, X. Y. (1997). Excavation engineering handbook, Chinese Construction Industry Press, Beijing.
Long, M. (2001). “Database for retaining wall and ground movements due to deep excavations.” J. Geotech. Geoenviron. Eng., 127(3), 203–224.
Mana, A. I., and Clough, G. W. (1981). “Prediction of movements for braced cuts in clay.” J. Geotech. Eng. Div., Am. Soc. Civ. Eng., 107(6), 759–777.
Ng, C. W. W. (1998). “Observed performance of multi-propped excavation in stiff clay.” J. Geotech. Geoenviron. Eng., 124(9), 889–905.
Ng, C. W. W. (1999). “Stress paths in relation to deep excavations.” J. Geotech. Geoenviron. Eng., 125(5), 357–363.
O’Rourke, T. D. (1981). “Ground movements caused by braced excavations.” J. Geotech. Eng. Div., Am. Soc. Civ. Eng., 107(9), 1159–1178.
Ou, C. Y., Liao, J. T., and Lin, H. D. (1998). “Performance of diaphragm wall constructed using the top-down method.” J. Geotech. Geoenviron. Eng., 124(9), 798–808.
Ou, C. Y., Shiau, B. Y., and Wang, I. W. (2000). “Three-dimensional deformation behavior of the Taipei National Enterprise Center (TNEC) excavation case history.” Can. Geotech. J., 37(2), 438–448.
Peck, R. B. (1969). “Deep excavation & tunneling in soft ground. State-of-the-art-report.” Proc., 7th International Conf. Soil Mechanics Foundation Engineering, 225–281.
Skempton, A. W. (1957). Discussion: “the planning and design of the new Hong Kong airport.” Proc. Inst. Civ. Eng., Struct. Build., 7, 305–307.
Terzaghi, K. (1943). Theoretical soil mechanics, Wiley, New York.
Whittle, A. J., Hashash, Y. M. A., and Whitman, R. V. (1993). “Analysis of deep excavation in Boston.” J. Geotech. Eng., 119(1), 69–90.
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© 2005 ASCE.
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Received: Dec 18, 2003
Accepted: Oct 20, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
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