Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay / Yong Tan in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 1 (Janvier 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 69-88 Titre : Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay Type de document : texte imprimé Auteurs : Yong Tan, Auteur ; Bin Wei, Auteur Année de publication : 2012 Article en page(s) : pp. 69-88 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Long and deep excavation Soft clay Field measurement Time effects Length Postexcavation Résumé : A 16–18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behaviors than other excavation projects because of its relatively long shape. Behaviors of deep excavations in Shanghai soft clay are affected not only by construction duration (i.e., time effects), but also by their geometries (i.e., space effects). This project serves as a special case study and provides insights into the design and construction of a long and deep excavation that uses the cut-and-cover technique in soft soils and in a metropolitan environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p69_s1?isAuthorized=no [article] Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay [texte imprimé] / Yong Tan, Auteur ; Bin Wei, Auteur . - 2012 . - pp. 69-88. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 69-88 Mots-clés : Long and deep excavation Soft clay Field measurement Time effects Length Postexcavation Résumé : A 16–18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behaviors than other excavation projects because of its relatively long shape. Behaviors of deep excavations in Shanghai soft clay are affected not only by construction duration (i.e., time effects), but also by their geometries (i.e., space effects). This project serves as a special case study and provides insights into the design and construction of a long and deep excavation that uses the cut-and-cover technique in soft soils and in a metropolitan environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p69_s1?isAuthorized=no

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