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Undrained expansion of a cylindrical cavity in clays with fabric anisotropy: theoretical solution


Abstract: This paper presents a novel, exact, semi-analytical solution for the quasi-static undrained expansion of a cylindrical cavity in soft soils with fabric anisotropy. This is the first theoretical solution of the undrained expansion of a cylindrical cavity under plane strain conditions for soft soils with anisotropic behaviour of plastic nature. The solution is rigorously developed in detail, introducing a new stress invariant to deal with the soil fabric. The semianalytical solution requires numerical evaluation of a system of six first-order ordinary differential equations. The results agree with finite element analyses and show the influence of anisotropic plastic behaviour. The effective stresses at critical state are constant, and they may be analytically related to the undrained shear strength. The initial vertical cross-anisotropy caused by soil deposition changes towards a radial cross-anisotropy after cavity expansion. The analysis of the stress paths shows that proper modelling of anisotropic plastic behaviour involves modelling not only the initial fabric anisotropy but also its evolution with plastic straining.



Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Acta Geotechnica June 2018, Volume 13, Issue 3, pp 729?746

Editorial: Springer

 Fecha de publicación: 01/06/2018

Nº de páginas: 58

Tipo de publicación: Artículo de Revista

DOI: 10.1007/s11440-017-0587-4

ISSN: 1861-1133,1861-1125

Url de la publicación: http://dx.doi.org/10.1007/s11440-017-0587-4

Autores/as

SIVASITHAMPARAM, NALLATHAMBY