A comparative micromechanical analysis of the effective properties of a geomaterial: Effect of mineralogical compositions

Ariane Abou-Chakra Guéry (1) , Fabrice Cormery (2) , Jian-Fu Shao (2) , Djimedo Kondo (2)

1 LMDC - Laboratoire Matériaux et Durabilité des constructions
2 LML - Laboratoire de Mécanique de Lille - FRE 3723

In order to provide a physical interpretation of the variation of the mechanical properties of Callovo-Oxfordian argillite with mineral composition, we implement three linear homogenization schemes. The argillite is modeled as a three phase material composed of a clay matrix and inclusions of quartz and calcite. It is shown that, unlike the dilute scheme and the self-consistent scheme, the Mori-Tanaka model describes the in situ experimental data well. The determined properties are finally used in a finite element computation. The aim is to evaluate the effect of mineral composition on the elastic response of the excavation of a vertical shaft in the context of the underground laboratory of Meuse/Haute Marne.

Mots clés: Geomaterials; Linear homogenization; Homogenization schemes; Experimental validation; Rock micromechanics

Ariane Abou-Chakra Guéry, Fabrice Cormery, Jian-Fu Shao, Djimedo Kondo. A comparative micromechanical analysis of the effective properties of a geomaterial: Effect of mineralogical compositions. Computers and Geotechnics, 2010, 37 (5), pp.585-593. ⟨10.1016/j.compgeo.2010.02.008⟩. ⟨hal-00525914⟩