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  Enhanced prediction of settlement in structured clays with examples from Osaka Bay
Titel: Enhanced prediction of settlement in structured clays with examples from Osaka Bay
Auteur: Rocchi, G.
Vaciago, G.
Fontana, M.
Plebani, F.
Verschenen in: Geomechanics and Geoengineering
Paginering: Jaargang 1 (2006) nr. 3 pagina's 217-237
Jaar: 2006-11-24
Inhoud: Enhanced settlement and pore pressure predictions in structured clays are shown to be possible by applying a framework specifically developed to identify metastable microstructure and to simulate with appropriate elastoviscoplastic models the associated destruction processes, which are responsible for large time-dependent strains (creep). Two well-documented case histories, Maishima island and Kansai International Airport Phase 1 island, are considered to support this conclusion. The 'field' behaviour of Osaka clays at these two sites demonstrates that 'primary compression' settlements predicted by elastoplastic models and conventional interpretation of oedometer tests may be substantially lower than observed, casting doubt on the uniqueness of the 'end of primary' (EOP) void ratio-effective stress relationship, which is found to provide reliable predictions only under special circumstances. The concepts of primary and secondary consolidation, and parameters such as the preconsolidation pressure [image omitted], the compression coefficient [image omitted] and secondary consolidation coefficient [image omitted] do not adequately describe soil compressibility in structured clays. More advanced models, which simulate the actual physical processes, do not need to resort to such concepts and parameters and thus this difficulty is overcome.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften

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