深部低透气性首采层煤与瓦斯气固耦合模型

doi:10.13722/j.cnki.jrme.2014.0106

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Abstract In order to eliminate the disturbances of coal permeability and diffusion coefficient on the correctness of coupled gas flow and coal deformation model. Firstly，the geostress condition of the first mined key seam is analyzed. Secondly，a modified P-M permeability model is proposed to match the pore structure characteristics of coal seam；Finally the governing equations for the coupled gas flow and solid deformation in dry coal seams are proposed，and the Klinkenberg effect has been taken into account，at the same time the relationships of the multiphysics fields have been discussed in detail. The coupled model has been used in simulating gas migration and permeability evolution in the first mined coal seam around drainage boreholes. Numerical results indicate that the Klinkenberg effect can have a critical influence on gas pressure during the entire methane degasification period，and the influence increases with time. The evolution of permeability is controlled by two opposite effects，compressive volumetric strain and matrix shrinkage，and the resulting permeability change is controlled by the mechanism that dominates.

Key words： mining engineering low permeability coal effective stress coal matrix shrinkage permeability model gas-solid coupled model

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0106 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/2749

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