Title: PERMEABILITY AND VOLUMETRIC CHANGES IN COAL UNDER DIFFERENT TEST ENVIRONMENT
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Authors: Aziz Naj, Ren Ting, Nemcik Jan and Zhang Lei
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DOI: 10.13168/AGG.2013.0016
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Journal: Acta Geodynamica et Geomaterialia, Vol. 10, No. 2 (170), Prague 2013
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Full Text:  PDF file (1.0 MB)
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Keywords: coal mine gas, coal permeability, volumetric changes
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| Abstract: Permeability refers to the ability of coal to transmit gas when a pressure or concentration gradient exists across it. The
permeability of coal is dependent upon factors that include effective stress, gas pressure, water content, disturbance associated
with drilling and matrix swelling/shrinkage due to adsorption/desorption. A programme of laboratory tests were conducted
on coal samples from the Bulli seam for evaluating the permeability and drainability of coal. Two different types of
permeability apparatus were used in this study. The methods of permeability testing of coal under different triaxial conditions
are discussed. Permeability testing of the Bulli seam coal with N2 is described. The laboratory test results were found to be in
agreement with the calculated permeability values. |
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Acta Geodynamica et Geomaterialia 
