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A multiscale modeling of damage and time-dependent behavior of cohesive rocks

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Abou-Chakra Guery Ariane; Cormery Fabrice; Shao Jian-Fu; Kondo Djimédo
journal (abréviation) International Journal for Numerical and Analytical Methods in Geomechanics (Int. J. Numer. Anal. Meth. Geomech.)
volume (numéro) 33 (5)
  
pages 567 – 589
résumé 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.
mots clés geomaterials • nonlinear homogenization • viscoplasticity and damage • unilateral effects • experimental validation • micromechanics • rocks
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