MATHEMATICAL MODEL OF COUPLED GAS FLOW AND COAL DEFORMATION PROCESS IN LOW-PERMEABILITY AND FIRST MINED COAL SEAM
LIU Qingquan1,CHENG Yuanping1,2,LI Wei1,JIN Kan1,HE Tao1,ZHAO Wei1
(1. Faculty of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;
2. State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,
Xuzhou,Jiangsu 221008,China)
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.
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LIU Qingquan1,CHENG Yuanping1,2,LI Wei1,JIN Kan1,HE Tao1,ZHAO Wei1. MATHEMATICAL MODEL OF COUPLED GAS FLOW AND COAL DEFORMATION PROCESS IN LOW-PERMEABILITY AND FIRST MINED COAL SEAM. , 2015, 34(s1): 2749-2758.
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