AN IMPROVED SOLUTION FOR THE EXPANSION OF CYLINDRICAL CAVITIES IN MODIFIED CAM CLAY.

Vincenzo Silvestri, Youssef Bentaiebi, Ghassan Abou- Samra, Mireille Sandrine Ewane, Christian Bravo-Jonard

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Soil Mechanics I / Mécanique des sols I

ABSTRACT: Recently the authors presented a semi-analytical solution for the undrained plane strain expansion of vertical cylindrical cavities in Modified Cam Clay, in which the hardening parameter , remained constant. This allowed the determination of explicit expressions for the principal effective stresses. In the present paper, the restriction imposed on is relaxed, as it varies during undrained shearing in Modified Cam Clay. The new semi-analytical solution is applied to a well-known benchmark case involving remoulded Boston Blue Clay. Comparisons are first made with the case of constant and then with both a finite difference solution and published finite element results.

RÉSUMÉ: Récemment, les auteurs ont présenté une solution semi-empirique de l™expansion non-drainée et en déformation plane d™une cavité cylindrique dans Cam Clay Modifiée, en gardant constant le paramètre de durcissement, Ceci a permit de déterminer exactement les contraintes effectives. Dans le présent article, la restriction imposée sur est relaxée, comme c™est le cas dans Cam Clay Modifié. La nouvelle solution est appliquée à un cas de référence très connu qui implique l™argile bleue de Boston. Des comparaisons sont effectuées avec le cas constant et aussi avec des solutions aux différences finies et aux éléments finis.

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