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    Observed Performance of a Deep Multistrutted Excavation in Shanghai Soft Clays

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2005:;Volume ( 131 ):;issue: 008
    Author:
    G. B. Liu
    ,
    Charles W. Ng
    ,
    Z. W. Wang
    DOI: 10.1061/(ASCE)1090-0241(2005)131:8(1004)
    Publisher: American Society of Civil Engineers
    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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      Observed Performance of a Deep Multistrutted Excavation in Shanghai Soft Clays

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    http://yetl.yabesh.ir/yetl1/handle/yetl/52737
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    contributor authorG. B. Liu
    contributor authorCharles W. Ng
    contributor authorZ. W. Wang
    date accessioned2017-05-08T21:28:17Z
    date available2017-05-08T21:28:17Z
    date copyrightAugust 2005
    date issued2005
    identifier other%28asce%291090-0241%282005%29131%3A8%281004%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/52737
    description abstractA 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.
    publisherAmerican Society of Civil Engineers
    titleObserved Performance of a Deep Multistrutted Excavation in Shanghai Soft Clays
    typeJournal Paper
    journal volume131
    journal issue8
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)1090-0241(2005)131:8(1004)
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2005:;Volume ( 131 ):;issue: 008
    contenttypeFulltext
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