Three-Dimensional Nonlinear Analyses of a Metro Tunnel in São Paulo Porous Clay, Brazil
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 137, Issue 4
Abstract
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.
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Acknowledgments
The writers would like to express their gratitude to Companhia do Metrô de São Paulo, especially Sergio Salvadori and Argimiro Ferreira, for providing the results of the field monitoring.
References
Almeida e Sousa, J. (1998). “Tunnelling in soft ground. Behaviour and numerical analysis.” Ph.D. thesis, Univ. of Coimbra, Portugal (in Portuguese).
Atkinson, J. H., and Potts, D. M. (1977). “Subsidence above shallow tunnels in soft ground.” J. Geotech. Eng. Div., 103(4), 307–325.
Azevedo, R. F., Parreira, A., and Zornberg, J. G. (2002). “Numerical analysis of a tunnel in residual soils.” J. Geotech. Geoenviron. Eng., 128(3), 227–236.
Celestino, T. B., and Ruiz, A. P. T. (1998). “Shape of settlement trough due to tunneling through different types of soft ground.” Felsbau, 16(2), 118–121.
Eisenstein, Z., and Negro, A. (1985). “Excavations and tunnels in tropical lateritic and saprolitic soil. General report, session 5.” Proc., 1st Int. Conf. Geomechanics in Tropical Lateritic and Saprolitic Soils, Associação Brasileira de Mecânica dos Solos e Engenharia Geotécnica (ABMS) (Brazilian Society for Soil Mechanics and Geotechnical Engineering), São Paulo, Brazil, 4, 299–333.
Farias, M. M., and Assis, A. P. (1996). “Numerical simulation of a tunnel excavated in porous collapsible soil.” Proc., Int. Symp. Geotechnical Aspects of Underground Construction in Soft Ground, A.A. Balkema, London, 2, 987–991.
Lade, P. V. (1979). “Stress-strain theory for normally consolidated clay.” Proc., 3rd Int. Conf. on Numerical Methods in Geomechanics, A.A. Balkema, London, 4, 1325–1337.
Mair, R. J., Taylor, R. N., and Bracegirdle, A. (1993). “Subsurface settlement profiles above tunnels in clays.” Géotechnique, 43(2), 315–320.
Marques, F. R., Almeida e Sousa, J., and Asis, A. P. (2006). “Analysis through finite elements of the behaviour of a tunnel of Brasília Metro excavated in porous soils.” Proc., 3rd Portuguese-Brazilian Geotechnical Conf., Associação Brasileira de Mecânica dos Solos e Engenharia Geotécnica (ABMS) [Brazilian Society for Soil Mechanics and Geotechnical Engineering], Curitiba, Brazil, 363–368 (in Portuguese).
Negro, A., and Eisenstein, Z. (1981). “Ground control techniques compared in three Brazilian water tunnels.” Tunnels and Tunnelling Int., Oct.–Nov.–Dec., 11–14, 52–54, 48–50.
Ortigão, J. A. R., Kochen, R., Farias, M. M., and Assis, A. P. (1996). “Tunneling in Brasília porous clay.” Can. Geotech. J., 33(4), 565–573.
Panet, M., and Guenot, A. (1982). “Analysis of convergence behind the face of a tunnel.” Proc., Tunnelling 82, Institute of Mining and Metallurgy, London, 197–204.
Parreira, A. B. (1991). “Analysis of shallow tunnels in soil. The Mineiro-Paraíso Tunnel at Paulista Avenue in São Paulo City.” Ph.D. thesis, Catholic Univ. of Rio de Janeiro, Rio de Janeiro, Brazil (in Portuguese).
Vargas, M. (1977). Introduction to soil mechanics, McGraw-Hill do Brasil, São Paulo, Brazil, 509 (in Portuguese).
Ward, W. H., and Pender, M. J. (1981). “Tunnelling in soft ground. General report, session 2,” Proc., 10th Int. Conf. Soil Mechanics and Foundation Engineering, Balkema, Rotterdam, Salem, NH, 4, 261–275.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 137 • Issue 4 • April 2011
Pages: 376 - 384
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 6, 2009
Accepted: Aug 10, 2010
Published online: Aug 31, 2010
Published in print: Apr 1, 2011
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