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A multiscale modeling of damage and time‐dependent behavior of cohesive rocks
Author(s) -
AbouChakra Guéry A.,
Cormery F.,
Shao J. F.,
Kondo D.
Publication year - 2008
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.727
Subject(s) - constitutive equation , micromechanics , matrix (chemical analysis) , geotechnical engineering , granular material , finite element method , materials science , viscoplasticity , statistical physics , geology , mechanics , structural engineering , engineering , physics , composite material , composite number
The present paper deals with a micromechanical approach to modeling the time‐dependent mechanical behavior of a class of cohesive geomaterials. The considered material is Callovo‐Oxfordian argillite, which is mainly composed of three constituents: an elastoviscoplastic clay matrix, elastic quartz minerals, and elastic damaged calcite grains. The macroscopic constitutive law is obtained by adapting the incremental method proposed by Hill ( J. Mech. Phys. Solids 1965; 13 :89–101). Its unified formulation allows a description of not only the time‐dependent behavior of the argillite but also its elastoplastic damage response. The developed model is first validated by comparison with finite element solutions and then it is applied to the prediction of argillites' macroscopic responses in connection with their mineralogical compositions. The validity of the model is checked through comparisons between the model's predictions and experimental data. Copyright © 2008 John Wiley & Sons, Ltd.