Influence of gas adsorption induced non-uniform deformation on the evolution of coal permeability

doi:10.1016/j.ijrmms.2018.12.021

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Influence of gas adsorption induced non-uniform deformation on the evolution of coal permeability
	Wei, Mingyao ; Liu, Jishan ; Elsworth, Derek ; Li, Shaojun ; Zhou, Fubao
刊名	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2019
卷号	114 期号:-页码:71-78
关键词	Local strain Coal permeability Non-uniform swelling Strain rate
ISSN号	1365-1609
DOI	10.1016/j.ijrmms.2018.12.021
英文摘要	When adsorbing gas is injected into coal, the gas fills in the fractures quickly and a pressure difference between matrix and fractures is created. Because of this difference, there is a pressure gradient within the matrix. The gradient evolves with time from the initial equilibrium (zero gradient) to the final equilibrium (zero gradient), so does the adsorption-swelling induced matrix deformation. Previous studies have not taken this effect into consideration. In this study, we hypothesize that the pressure gradient affects the expansion of the gas-invaded area/volume with the matrix and the propagation of the expansion front creates a non-uniform deformation within the matrix. Under this hypothesis, a relation between coal permeability and the expansion of the gas-invaded area with the matrix can be established. When the gas-invaded area is localized in the vicinity of the fracture wall, the expansion of the matrix within this area narrows the fracture opening. We define this as local swelling/shrinking. This local swelling/shrinking is controlled primarily by the coal internal structure. When the gas-invaded area is further spread over the matrix, the expansion of the whole matrix may narrow or widen the fracture opening depending on the external boundary conditions. This global swelling/shrinking is controlled primarily by the external boundary conditions. These conceptual understandings are defined through strain rate-based coal permeability models for both the matrix and the fractures. This strain rate based time-dependent permeability model was verified against experimental observations, that couples coal deformation, the gas flow in the matrix system and gas flow in the fracture system.
WOS研究方向	Engineering ; Mining & Mineral Processing
语种	英语
WOS记录号	WOS:000456772700008
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15058]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Univ Western Australia, Sch Engn, Dept Chem Engn, O35 Stirling Highway, Perth, WA 6009, Australia; 3.Penn State Univ, G3 Ctr, Dept Energy & Mineral Engn, University Pk, PA 16802 USA; 4.Penn State Univ, Energy Inst, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Wei, Mingyao,Liu, Jishan,Elsworth, Derek,et al. Influence of gas adsorption induced non-uniform deformation on the evolution of coal permeability[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2019,114(-):71-78.
APA	Wei, Mingyao,Liu, Jishan,Elsworth, Derek,Li, Shaojun,&Zhou, Fubao.(2019).Influence of gas adsorption induced non-uniform deformation on the evolution of coal permeability.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,114(-),71-78.
MLA	Wei, Mingyao,et al."Influence of gas adsorption induced non-uniform deformation on the evolution of coal permeability".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 114.-(2019):71-78.