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Instability in loose sand: Experimental results and numerical simulations with a microstructural model

TitleInstability in loose sand: Experimental results and numerical simulations with a microstructural model
Publication TypeJournal Article
Year of Publication2011
AuthorsDaouadji A, Hicher P-Y, Chang CS, Jrad M., Algali H.
JournalSpringer Series in Geomechanics and Geoengineering
Start Page13
Pagination13-31
ISSN1866-8755
ISBN Number978-3-642-18283-9
Keywordsgranular material, instability, Micromechanics, sand, Stress-strain relationship
Abstract

Under certain loading conditions, loose sand can develop instability at a shear stress level much lower than the critical state failure line. To analyze these types of problems, we have adopted the micromechanics model developed by Chang and Hicher for modelling granular material behaviour. The stress-strain relationship for a granular assembly is determined by integrating the behaviour of the inter-particle contacts in all orientations. The constitutive model is applied to simulate undrained triaxial, constant-q and proportional strain tests on loose Hostun sand. Experimental results are used to evaluate how well the model can capture the modes of instability at the assembly level. The notion of control variables is discussed according to these different loading conditions.

DOI10.1007/978-3-642-18284-6_2