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Failure criteria and plane strain collapse

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The use of numerical analyses of boundary values problems has become very frequent in both research and geotechnical practice. There are numerous examples of the successful application of these techniques to even very complex situations. Surprisingly, however, simple geotechnical problems can be found in the literature for which the use of these techniques is problematic, even when the soil behaviour is reproduced by means of very simple constitutive models, such as those based on the theory of perfect plasticity. In this talk it will be shown that many of the problems are related to the formulation of classical failure criteria for geomaterials and that the adoption of a very recent reformulation of two such criteria, namely the Mohr-Coulomb and the Matsuoka-Nakai, allows to perform the analyses without any problem. As numerical analyses are often performed by considering a cross section of an infinite long structure, the link between failure conditions and plane strain plastic collapse will be also discussed and sources of potential problems highlighted.

Rocco Lagioia. He obtained his honor degree in Structural Engineering from the University of Bari, Italy (now Technical University). After two years full time consulting as concrete structure designer he moved to Milan University of Tecnology (Politecnico) where he started his Ph.D. in Geotechnical Engineering, studying the stress-strain response of structured soils. He worked at Imperial College with Peter Vaughan on the experimental behaviour of these geomaterials and then completed the Ph.D. in Milan with Roberto Nova where he developed a constitutive model for those soils. He then moved to École Nationale des Ponts et Chaussées for his post-doc and from there back to Imperial College as a research fellow. After going back to Milan, he became lecturer and then associate professor of Geotechnical Enginering at the University of Brescia. He has built two laboratories, for the Politecnico Milan and for the University of Brescia , consulted for the development of the laboratory of the second University of Milan Bicocca and has designed and constructed numerous laboratory apparatuses. His research interests are in experimental soil mechanics, constitutive modelling and numerical analyses. He is currently member of the advisory panels of Géotechnique and Géotechnique Letters.

This talk is part of the Engineering Department Geotechnical Research Seminars series.

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