NDLI: A combined method for evaluation and prediction on permeability in coal seams during enhanced methane recovery by pressure-relieved method

Content Provider	Springer Nature Link
Author	Xue, D. J. Zhou, H. W. Chen, C. F. Jiang, D. Y.
Copyright Year	2015
Abstract	Pressure-relieved coal mining method has been successfully carried out in many mines in China, especially in high gassy mines. The motivation for the paper is to help engineers fill the knowledge gap on how to evaluate how the permeability changes and effect on improving low permeability prior to its construction. A new method is proposed in a combined theoretical and experimental way in laboratory. On the tests, the volumetric strain-dependent permeability is obtained based on triaxial compression tests. Then, we have designed a physical modeling experiment to know the mining field deformation especially in the subsidence data, which is easily measured and reliable ignoring the continuum concept hypothesis. Another, based on semi-infinite integral model, the theoretical formulas of subsidence are solved consistent with the testing result from the physical modeling. The volumetric strain derived from the semi-infinite integral model is proposed to establish the relationship between permeability and volumetric deformation of mining field. Finally, the pressure-relieved effect on changing permeability is studied and discussed. The results show that the combined method is a good way to determine the distribution on permeability changing with advancing distances, also a good tool for improving the traditional predraining borehole layout and opportunity to extract gas methane.
Starting Page	5963
Ending Page	5974
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	10
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pressure-relieved coal mining Permeability Volumetric strain Physical modeling Triaxial compression Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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