Geotechnical characterization by in situ and lab tests to the back-analysis of a supported excavation in metro do porto

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

António Viana da Fonseca (Autor) FEUP; Sara Rios Silva (Autor) FEUP; Nuno Cruz (Autor) Outra

Revista

Título: Geotechnical and Geological Engineering

Vol. 28 Nº 3

Páginas: 251-264

ISSN: 0960-3182

Indexação

ISI Web of Knowledge

Scopus - 17 Citações

COMPENDEX

INSPEC

Outras Informações

ID Authenticus: P-007-T45

DOI: 10.1007/s10706-008-9183-6

Abstract (EN): This paper summarizes the geotechnical characterization conducted for the design and subsequent analysis of a strutted excavation in "Metro do Porto". This region is geologically dominated by heterogeneous weathered granite masses with deep residual soil profiles. Local saprolitic soils exhibit, by their nature, a particular behavior characterized by very sensitive and weak relic micro-structures, due to their specific genesis. This study has included the interpretation of a significant volume of in situ test results, triaxial tests over undisturbed samples and monitoring data, giving rise to specific correlations between testing and design parameters. Real time monitoring enabled a back-analysis by FEM of a well instrumented section of the strutted excavation, which was calibrated taking into account the derived correlations and the deformability behavior of this specific geotechnical ambient. This geomaterial, although revealing very high initial stiffness values (for very small strain ranges) has shown low stiffness values for "medium to high" strain levels, reflecting a singular strong non-linearity in the stress-strain behavior. © Springer Science+Business Media B.V. 2008.

Idioma: Inglês

Tipo (Avaliação Docente): Científica