VISUAL SIMULATION ON COUPLING MODEL OF SOLID DEFORMATION AND GAS LEAK FLOW
煤层气越流固-气耦合模型及可视化模拟研究

Based on the new viewpoint of the interaction between solid deformation and gas leak flow,the mechanism of gas leakage in double deformable coal seam can be understood. Under the action of geophysical fields,the methane gas flowing in double deformable coal seam can be essentially considered the compressionable gas flowing with time-dependent mixed permeation and diffusion through a pore-cleat deformable medium of the heterogeneous anisotropic coal seam. Then based on this new viewpoint,the coupling mathematical model for coal-seam deformation and gas leakage flow in double coal-seam is formulated and the practical numerical simulations for gas emission from area close to up (down) coal seam is successfully achieved. Therefore the conclusion can be drawn from this study that the coupling models might be closer to actual situation. Meanwhile it is effective for SIP(strong implicit procedure) analysis on the coupling models for coal-seam deformation and gas leakage flow. At the same time,applying three-dimensional computer simulation technology,the macroscopic feature of the effective coupled gas leak flow and coal-rock mass deformation can be reappeared visually,and a feasible new method is offered for control of the underground coal gas leak flow and prediction of coal gas gushing from the near layer.