Implementation algorithm of a generalised plasticity model for swelling clays

Sánchez, Marcelo; Gens, Antonio; Guimarães, L. J. N.; Olivella, S.

doi:10.1016/j.compgeo.2008.08.004

Cited by 33 publications

(26 citation statements)

References 20 publications

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“…These pores are part of the clay matrix fabric itself, and would contain bound water with properties different than bulk water (Dewhurst et al, 1999). Such a dual-porosity model is similar to the conceptual model of Sanchez et al (2008), as used by them in developing a mechanical constitutive model for partially saturated clays. FIB-SEM image data sets such as the ones presented here could be used to better constrain conceptual, pore scale, and continuum scale models for reactive transport, single and multiphase flow, and geomechanical response of shale gas formations.…”

Section: Discussionmentioning

confidence: 98%

Three-dimensional pore networks and transport properties of a shale gas formation determined from focused ion beam serial imaging

Dewers¹,

Heath²,

Ewy³

et al. 2012

IJOGCT

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Three-dimensional pore network reconstructions of mudstone properties are made using dual focused ion beam-scanning electron microscopy (FIB-SEM). Samples of Jurassic Haynesville Formation mudstone are examined with FIB-SEM and image analysis to determine pore properties, topology, and tortuosity. Resolvable pore morphologies (>~10 nm) include large slit-like pores between clay aggregates and smaller pores in strain shadows surrounding larger clastic grains. Mercury injection capillary pressure (MICP) data suggest a dominant 1-10 nm or less size of pores barely resolvable by FIB-SEM imaging. Computational fluid dynamics modelling is used to calculate single phase permeability of the larger pore networks on the order of a few nanodarcys (which compare favourably with core-scale permeability tests). This suggests a pore hierarchy wherein permeability may be limited by connected networks of inter-aggregate pores larger than about 20 nm, while MICP results reflect smaller connected networks of pores residing in the clay matrix. [Received: May 12, 2011; Accepted: September 14, 2011] Keywords: shale gas; Haynesville formation; pore networks; focused ion beam; FIB.Reference to this paper should be made as follows: Dewers, T.A., Heath, J., Ewy, R. and Duranti, L. (2012) 'Three-dimensional pore networks and transport properties of a shale gas formation determined from focused ion beam serial imaging ', Int. J. Oil, Gas and Coal Technology, Vol. 5, Nos. 2/3, 230 T.A. Dewers et al.Biographical notes: Thomas A. Dewers is a principal member of the technical staff in the Geomechanics Department at Sandia National Laboratories in Albuquerque, New Mexico. He has over 21 years experience in industry, academia, and government relating to work in the geosciences, and holds a PhD in Geology. His current research interests include nano-to-reservoir scale inquiries into rock mechanics, multiphase flow and reactive transport.Jason Heath is a senior member of the technical staff of the Geophysics and Atmospheric Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico. He has a PhD and MS in Hydrology and Geology, respectively. His research focuses on efficiently estimating well injectivity for large-scale CO 2 storage projects, CO 2 -water-rock interactions, and caprock sealing behaviour.

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Section: Discussionmentioning

confidence: 98%

Three-dimensional pore networks and transport properties of a shale gas formation determined from focused ion beam serial imaging

Dewers¹,

Heath²,

Ewy³

et al. 2012

IJOGCT

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show abstract

“…The other model proposed by Sun and Sun [55] is able to couple the effects of degree of saturation on the mechanical behavior and void ratio on the water retention behavior. There are several numerical codes, such as the CODE_BRIGTH [46,49] and SNAC [52], in which some advanced elasto-plastic models for unsaturated (expansive) soils have been incorporated. Careful application of these models in analyzing the stability of unsaturated expansive soil slopes is expected to provide more simulations of failure mechanism where plastic straining and deformation are of primary concern.…”

Section: Soil Propertiesmentioning

confidence: 99%

Hydro-mechanical coupling effect on surficial layer stability of unsaturated expansive soil slopes

Vanapalli

2015

Computers and Geotechnics

128

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“…González and Gens [42] compared both an implicit and an explicit scheme for integrating the BBM and found that the latter is more robust and efficient. However, explicit schemes usually require to determine the intersection between the current yield surface and the elastic trial stress path and some substepping methods to control the integration error [102,110,111,112,113,119,120].…”

Section: Finite Element Implementationmentioning

confidence: 99%