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| Evolution and numerical simulation of coal permeability during gas drainage in coal seams |
| WANG Dengke1，2，3，PENG Ming1，2，FU Qichao1，2，QIN Hengjie1，2，XIA Yuling4 |
| (1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；3. The Collaborative Innovation Center of Coal Safety Production of Henan，Jiaozuo，Henan 454000，China；4. College of Computer Science and Technology，Henan Polytechnic University，Jiaozuo，Henan 454000，China) |
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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.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2016, Vol. 35 
