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Wei Li,Yuan-ping Cheng,Pin-kun Guo,Feng-hua An,Ming-yi Chen 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.4
The mining of protective coal seams can cause changesin geostress, leading to changes in the permeability of coal rock and creatingfavorable conditions for gas extraction from coal seams. Atthe Haishiwan Coal Mine, field tests using remote protective coalseam mining were performed in the protected layer, which is richin CO2 gas. In remote protective longwall mining, the permeabilityand composition of extracted stress-relief gas can vary. Under theconditions of remote protective longwall mining, the permeabilityof a protected coal seam can be generally described by the Liumodel. During protective layer mining, the permeability of theprotective layer increases rapidly with the release of stress, thendecreases gradually with the recovery of the geostress. However,matrix shrinkage and decreased pore pressure caused by CO2 desorptionfrom coal seams also cannot be ignored when considering thefactors that affect the permeability. Thus, it is necessary to appropriatelyconfigure the cross-measure boreholes in advance to drainthe stress-relief gas during remote protective layer mining. StressreliefCO2 gas extraction presents multiple consecutive peaks. TheNo. 2 coal seam has different trap pressure systems as CO2 migratesinto the coal seam. The protected seam experiences different effectivestresses during protective layer mining, and the permeabilitiesappear to periodically increase due to differences in the originalpermeability. The various permeability and diffusion coefficientsfor CO2 and CH4 in coal induce CO2 and CH4 fractionation in theroof and floor of the No. 2 coal seam.
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