Permeability changes of coal cores and briquettes under tri-axial stress conditions

0437714 - ÚGN 2015 RIV PL eng J - Journal Article
Wierzbicki, M. - Konečný, Pavel - Kožušníková, Alena
Permeability changes of coal cores and briquettes under tri-axial stress conditions.
Archives of Mining Sciences. Roč. 59, č. 4 (2014), s. 1129-1138. ISSN 0860-7001. E-ISSN 1689-0469
R&D Projects: GA MŠMT ED2.1.00/03.0082
Institutional support: RVO:68145535
Keywords : coal * gas permeability * tri-axial stress * coal briquettes
Subject RIV: DH - Mining, incl. Coal Mining
Impact factor: 0.608, year: 2013
http://mining.archives.pl

The paper is dealing with the permeability of coal in triaxial state of stress. The permeability of coal, besides coal’s methane capacity, is the main parameter determining the quantity of methane inflow into underground excavations. The stress in a coal seam is one of the most important factors influencing coal permeability therefore the permeability measurements were performed in tri-axial state of stress. The hydrostatic three-axial state of stress was gradually increased from 5MPa with steps of 5MPa up to a maximum of 30MPa. Nitrogen was applied as a gas medium in all experiments. The results of the permeability measurements of coal cores from the “Zofiówka” mine, Poland, and three mines from the Czech Republic are presented in this paper. As a “reference”, permeability measurements were also taken for coal briquettes prepared from coal dust with defined porosity. It was confirmed that the decreasing porosity of coal briquettes affects the decreasing permeability.
Permanent Link: http://hdl.handle.net/11104/0241218