Sedimentation–consolidation of a double porosity material

Wong, Henry; Leo, Chin Jian; Pereira, Jean‐Michel; Dubujet, Philippe

doi:10.1016/j.compgeo.2006.12.001

Cited by 2 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Van Genuchten used a bell‐shaped PSD curve to relate the degree of saturation to capillary pressure on the one hand and to the material relative permeability on the other hand. More recent studies resort to the PSD curve to determine the retention and permeability properties of bimodal porous media . However, these studies deal with undamaged materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of damage on pore size distribution and permeability of rocks

Arson

Pereira

2012

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

International audienceThe model proposed in this article relates permeability to porosity measurements that can easily be performed in the laboratory. The pore size distribution (PSD) curve is updated with strains and damage. The updated volumetric fractions of natural pores and cracks are introduced in the expression of permeability. Contrary to classical permeability models based on PSD integrations, the model proposed in this article accounts for possible changes in the porosity modes: one mode for undamaged samples and two modes for cracked samples. The proposed approach also accounts for varying states of damage, as opposed to classical fracture network models, in which the cracks pattern is fixed. The only material parameters that are required to describe the microstructure are the lower and upper bounds of the pores size for both natural pores and cracks. All the other PSD parameters involved in the model are related to macroscopic parameters that can easily be determined in the laboratory, such as the initial void ratio. The framework proposed in this article can be used in any damage constitutive model to determine the permeability of a brittle porous medium. Drained triaxial compression tests have been simulated. Before cracks initiation, permeability decreases while the larger natural pores are getting squeezed. After the occurrence of damage, permeability grows due to the increase of cracks density. The model performs well to represent the influence of the confining pressure on damage evolution and permeability variations. © 2012 John Wiley and Sons, Ltd

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of damage on pore size distribution and permeability of rocks

Arson

Pereira

2012

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…Moreover, most of the fracture network models do not account for the deformation of the solid skeleton nor the evolution of damage. Double porosity models overcome this limitation: for instance, Wong et al [24] proposed to equate fluid flow from one porous network to the other as a phase change.…”

Section: Introductionmentioning

confidence: 99%

Retention and permeability properties of damaged porous rocks

Pereira

Arson

2013

Computers and Geotechnics

View full text Add to dashboard Cite

International audienceThe objective of this research work is to model the influence of deformation and damage on the permeability and retention properties of cracked porous media. This is achieved thanks to the introduction of microscale information into a macroscopic damage model. To this end, the Pore Size Distribution (PSD) of the material is coupled to the mechanical behaviour of the rock. Changes to this distribution due to deformation and damage are modelled and then used to capture induced changes to the retention and permeability properties of partially saturated materials. Rock microstructure is characterized by the size distributions of natural pores and cracks, which are used to update intrinsic permeability with Hagen-Poiseuille flow equation and Darcy's law. The void space occupied by water is computed by integrating the pore size distributions of natural pores and cracks up to the capillary pore radius (r(sat)). Laplace equation is used to relate r(sat) to the capillary pressure. The paper explains how to update PSD parameters with the macroscopic variables (such as deformation and damage), and then how to update permeability and retention properties with the PSD parameters. Conventional triaxial compression tests are simulated under controlled capillary pressure and under controlled water content. The proposed model captures well the intrinsic permeability decrease associated to the elastic compression of the natural pores, followed by the permeability jump due to crack opening. The modeling framework can be adapted to any rock constitutive model, including thermo-hydro-chemo-mechanical couplings. Applications may be found in energy production, ore exploitation and waste management

show abstract

Sedimentation–consolidation of a double porosity material

Cited by 2 publications

References 20 publications

Influence of damage on pore size distribution and permeability of rocks

Influence of damage on pore size distribution and permeability of rocks

Retention and permeability properties of damaged porous rocks

Contact Info

Product

Resources

About