The impact of effective stress and gas slippage on coal permeability under cyclic loading

doi:10.1016/j.jngse.2016.02.037

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	The impact of effective stress and gas slippage on coal permeability under cyclic loading
	Yu, Hongdan 1; Zou, Junpeng 1; Chen, Weizhong 1,2; Yang, Diansen 1; Yuan, Jingqiang 1
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2016
卷号	31 页码:236-248
关键词	Effective stress Gas slippage effect Permeability Cyclic loading
ISSN号	1875-5100
DOI	10.1016/j.jngse.2016.02.037
英文摘要	The determination of the effective stress coefficient of porous media (such as coal) remains a controversial issue. The purpose of this paper is to determine the effective stress coefficient of coal during gas penetration and to investigate the impact of effective stress and gas slippage on coal permeability under cyclic loading conditions. Analyzing the evolution law of coal anisotropic permeability with effective stress allows the deformation characteristics of the coal's internal structure, such as cleat or bedding, to be studied. The effective stress coefficient of long flame coal is obtained through modified permeability models based on experimental data. Test results show that the slippage effect significantly influences the permeability of coal samples, specifically in the range of low pore gas pressure, and that the effect of gas slippage is larger than that of effective stress. Permeability decreases gradually when effective stress increases, but it increases during unloading, and ascending and descending curves show significant irreversibility of permeability. Moreover, PLR (permeability loss rate) and IPLR (irreversible permeability loss rate) results indicate that the influence of effective stress on permeability perpendicular to bedding is greater than that of permeability parallel to bedding and that the ability of the cleat to resist deformation induced by effective stress is weaker than that of bedding. Under identical pressure conditions, the cleat shows more vulnerability and produces larger plastic deformation. (C) 2016 Elsevier B.V. All rights reserved.
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000376799700023
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3859]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Shandong Univ, Geotech & Struct Engn Res Ctr
推荐引用方式 GB/T 7714	Yu, Hongdan,Zou, Junpeng,Chen, Weizhong,et al. The impact of effective stress and gas slippage on coal permeability under cyclic loading[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2016,31:236-248.
APA	Yu, Hongdan,Zou, Junpeng,Chen, Weizhong,Yang, Diansen,&Yuan, Jingqiang.(2016).The impact of effective stress and gas slippage on coal permeability under cyclic loading.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,31,236-248.
MLA	Yu, Hongdan,et al."The impact of effective stress and gas slippage on coal permeability under cyclic loading".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 31(2016):236-248.