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Modelling the poroelastoplastic behaviour of soils subjected to internal erosion by suffusion
Author(s) -
Rousseau Quentin,
Sciarra Giulio,
Gelet Rachel,
Marot Didier
Publication year - 2020
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.3014
Subject(s) - internal erosion , geotechnical engineering , dissipation , mechanics , erosion , soil water , constitutive equation , poromechanics , geology , engineering , structural engineering , physics , thermodynamics , soil science , porosity , porous medium , finite element method , levee , paleontology
Granular soils subjected to seepage flow may suffer suffusion, ie, a selective internal erosion. Extending the classical approach of poromechanics, we deduce a new form of the Clausius‐Duhem inequality accounting for dissipation due to suffusion, and we deduce restrictions on the constitutive laws of the soil. We suggest (a) a possible coupling between the seepage forces and the suffusion kinetics and (b) an extension of an existing elastoplastic model for the skeleton mechanical behaviour. Numerical integrations of the elastoplastic model are carried out under drained axisymmetric triaxial and oedometric conditions. As a result, we prove that the extended model is able to qualitatively reproduce the suffusion induced strains and the strength reduction experimentally observed. Predictions on the oedometric behaviour of suffusive soils are also provided.