期刊
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
卷 29, 期 7, 页码 663-689出版社
WILEY
DOI: 10.1002/nag.431
关键词
model evaluation; non-coaxial kinematic models; granular materials; numerical simulations; distinct element method
资金
- Engineering and Physical Sciences Research Council [GR/R85785/01] Funding Source: researchfish
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 (DSR2 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 DSR2 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 (c) 2005 John Wiley & Sons, Ltd.
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