瓦斯抽采过程中的煤层透气性动态演化规律与数值模拟

doi:10.13722/j.cnki.jrme.2015.0931

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Abstract In order to investigate the variation of permeability during the gas drainage in coal seams，a model of variation of coal permeability was established based on the Kozeny-Carman equation，the theories of surface physical chemistry and effective stress of the coal containing gas. The effects of the effective stress，gas desorption and coal matrix shrinking were taken into account in the model and the permeability variation during the gas drainage in coal seams was analyzed using the numerical simulation method. The proposed model was found to describe effectively the variation of permeability during the gas drainage in coal seams. The relationship between the permeability and gas pressure displayed a“V”-shape trend of variation. The coal matrix shrinking was the dominant factor in the low gas pressure stage，and coal permeability increased with the decrease of gas pressure. The effective stress effect was the dominant factor in the high gas pressure stage，and coal permeability increased with the increase of gas pressure. If the distance between the specific point in coal body and the gas drainage hole wall decreased gradually，the coal permeability dropped firstly and then went up when gas pressure was relative high，and the coal permeability increased continuously when the gas pressure was relatively low.

Key words： mining engineering gas drainage in coal seams coal permeability porosity dynamic evolution numerical simulation

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0931 OR http://www.rockmech.org/EN/Y2016/V35/I04/704

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