Three-dimensional nonlinear analyses of a metro tunnel in Sao Paulo porous clay

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Manuel Matos Fernandes (Autor) FEUP

Revista

Título: Journal of geotechnical and geoenvironmental engineering

Vol. 137 Nº 4

Páginas: 376-384

ISSN: 1090-0241

Editora: ASCE-AMER SOC CIVIL ENGINEERS

Outras Informações

DOI: 10.1061/(ASCE)GT.1943-5606.0000433

Abstract (EN): Tropical residual clays with a highly porous structure react to the stress changes induced by tunneling in such a way that surface settlements can be larger than crown-level settlements along a tunnel axis. This behavior, which is not readily simulated by most numerical analyses, was also observed in the Paraiso tunnel, built for the São Paulo Metro, Brazil. This is a shallow tunnel driven through porous clayey soils by the sequential method. Detailed results of field monitoring are presented and discussed. 3D finite-element analyses that allowed a detailed simulation of the construction sequence have been carried out, considering two distinct constitutive models for the soil: a simple elastic-perfectly-plastic Mohr-Coulomb model, and the elastoplastic model developed by Lade. The results of these analyses are compared with the observed behavior as well as with the results from a plane strain finite-element analysis. It is shown that only the 3D finite-element analysis coupled with the more sophisticated soil constitutive model provides a full reproduction of field performance, with particular relevance for the deformations in the soil mass over the tunnel. © 2011 American Society of Civil Engineers.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9