Modelling anisotropic adsorption-induced coal swelling and stress dependent anisotropic permeability

Chen, Min, Masum, Shakil, Sadasivam, Sivachidambaram ORCID: https://orcid.org/0000-0002-2305-0292 and Thomas, Hywel ORCID: https://orcid.org/0000-0002-3951-0409 2022. Modelling anisotropic adsorption-induced coal swelling and stress dependent anisotropic permeability. International Journal of Rock Mechanics and Mining Sciences 153 , 105107. 10.1016/j.ijrmms.2022.105107

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Abstract

To investigate the anisotropy of coal swelling, this study proposes an effective stress model for saturated, adsorptive fractured porous media by considering gas adsorption induced surface stress change on solid-fluid interface. The effective stress model can be used to capture the anisotropic swelling of coal combining anisotropic mechanical properties and to link with the anisotropic permeability. Direction dependent fracture compressibility is used to describe the evolution of anisotropic stress-dependent permeability behaviour. Particularly, the impact of gas adsorption on fracture compressibility is considered in the model. The proposed models were tested against experimental results and compared to relevant existing models available in literatures. The model predicts that the coal swelling in the direction perpendicular to the bedding plane, is greater than that in the parallel plane. Coal permeability in each direction can be affected by the stress changes in any directions. The permeability parallel to the bedding plane is more sensitive to change in stresses than in perpendicular to the bedding due to higher fracture compressibility. The cleat compressibility could increase with gas adsorption, especially for carbon dioxide. Permeability loss in the direction parallel to the bedding plane is more significant than that in the direction perpendicular to the bedding plane. The presented models provide a tool for quantifying gas adsorption-induced anisotropic coal swelling and permeability behaviours.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Publisher:	Elsevier
ISSN:	1365-1609
Date of First Compliant Deposit:	7 April 2022
Date of Acceptance:	23 March 2022
Last Modified:	05 Jan 2024 08:08
URI:	https://orca.cardiff.ac.uk/id/eprint/149101

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