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2014, Volume 8, Issue 3

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Frontiers of Structural and Civil Engineering >> 2014, Volume 8, Issue 3 doi: 10.1007/s11709-014-0253-y

Ground movements due to deep excavations in Shanghai: Design charts

1. Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom.2. Advanced Geomechanics, Perth, Western Australia 6009, Australia.3. Department of Civil Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom.4. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.5. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

Available online: 2014-08-19
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Abstract

Recent research has clarified the sequence of ground deformation mechanisms that manifest themselves when excavations are made in soft ground. Furthermore, a new framework to describe the deformability of clays in the working stress range has been devised using a large database of previously published soil tests. This paper aims to capitalize on these advances, by analyzing an expanded database of ground movements associated with braced excavations in Shanghai. It is shown that conventional design charts fail to take account either of the characteristics of soil deformability or the relevant deformation mechanisms, and therefore introduce significant scatter. A new method of presentation is found which provides a set of design charts that clarify the influence of soil deformability, wall stiffness, and the geometry of the excavation in relation to the depth of soft ground.

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