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Kinematic models for non‐coaxial granular materials. Part II: evaluation
Author(s) -
Jiang M. J.,
Harris D.,
Yu H. S.
Publication year - 2005
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.431
Subject(s) - kinematics , coaxial , granular material , engineering , mechanics , structural engineering , geotechnical engineering , mechanical engineering , geology , physics , classical mechanics
In this paper we present results of numerical simulations for the evaluation of kinematic models for non‐coaxial granular materials by the distinct element method (DEM). Strain‐rate controlled monotonic and cyclic un‐drained simple shear tests were specifically designed and evaluation criteria established for this purpose. The models examined are the double‐shearing model, the double‐sliding free‐rotating model, and the double slip and rotation rate model (DSR 2 model) proposed by the authors (see the accompanying paper). It is shown that the assumption used in the double‐shearing model appears to not be in agreement with the DEM data. It is also shown that in the double‐sliding free‐rotating model the energy dissipation requirements appear to be unduly restrictive as a constitutive assumption. The DSR 2 model, which is a hybrid of discrete micro‐mechanics and continuum modelling, gives better agreement with the results of our DEM simulations, than either the double‐shearing model or the double‐sliding free‐rotating model. Copyright © 2005 John Wiley & Sons, Ltd.