Observed Performance of a Deep Multistrutted Excavation in Shanghai Soft Clays

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 dissipation of pore water pressures were observed. By using Tezaghi's one dimensional consolidation theory, the observed settlements were found to be attributed to the primary consolidation rather than creep effects.

Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
Authors:
- Liu, G B
- Ng, Charles WW
- Wang, Z W
Publication Date: 2005-8-1

Language

English

Media Info

Media Type: Print
Features: Figures; References; Tables;
Pagination: pp 1004-1013
Serial:
- Journal of Geotechnical and Geoenvironmental Engineering
- Volume: 131
- Issue Number: 8
- Publisher: American Society of Civil Engineers
- ISSN: 1090-0241
- Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

TRT Terms: Deflection; Earth pressure; Excavation and tunneling; Pore water pressures; Settlement (Structures); Soft clays; Underground construction
Geographic Terms: China; Shanghai (China)
Subject Areas: Bridges and other structures; Construction; Design; Highways; Public Transportation; I25: Design of Tunnels;

Filing Info

Accession Number: 01002655
Record Type: Publication
Files: TRIS
Created Date: Jul 28 2005 1:57PM