An original constitutive law for Callovo-Oxfordian argillite, a two-scale double-porosity material

A coupled poroplastic damage model accounting for cracking effects on both hydraulic and mechanical properties of unsaturated media

“…It is observed that this PSD is clearly bimodal, with crack size two or three orders of magnitude higher than pore size. The partial PSD concerning natural pores also fits quite well with the experimental result of the PSD curve of intact argillite [63]. During the growth of damage (direction of the arrow in Figure 3), only the volumetric fraction of cracks ϕ c /ϕ evolves, while the shape of each partial PSD (its mean value and standard deviation) does not change.…”

Semipermeable Membrane Properties and Chemomechanical Coupling in Clay Barriers

“…These techniques include mixture theory, volume averaging, and homogenization. All the results obtained from these upscaling techniques applied to clay geomaterials confirm that the conventional effective stress tensor, s 0 , should be rewritten as follows (Hueckel, 1992;Murad et al, 1995;Murad and Cushman, 1996;Bennethum et al, 1997;Murad, 2002, 2003;Dormieux et al, 2006;Giraud et al, 2007;Ortega et al, 2007;Cariou et al, 2013):…”

“…More recently, in the framework of a microporomechanical approach and by assuming a very weak normal stiffness of the clay mineral particles compared to the elasticity of the clay mineral layer solid component, an isotropic swelling (isotropic distribution of the clay mineral particles orientations), and no shear component for P, Dormieux et al (2006) and Cariou et al (2013) obtained a simplified expression for the macroscopic P tensor: (8.58) where p N is the (microscopic) normal component of the disjoining pressure and the quantity g is a function of the volume fraction of the interparticle pores named 4, which corresponds to the macropores porosity:…”

Measurement of the elastic properties of swelling clay minerals using the digital image correlation method on a single macroscopic crystal

“…In geophysics, because clay minerals are an integral part of many geological formations, reservoir characterization using seismic waves requires the elastic parameters of solid components and pore fluids to be known (e.g., Wang et al, 2001;Vanorio et al, 2003;Mondol et al, 2008;Mavko et al, 2009). In geomechanics, micromechanical or multiscale modeling of the mechanical behavior of clayey geomaterials uses the values of elastic constants of clay minerals at the lowest scale as input data (e.g., Giraud et al, 2007;Ortega et al, 2007;Cariou et al, 2013).…”