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为探究流固耦合作用下的煤层注水压力及渗透率分布规律,首先建立以广义达西定律为基础的数学模型。然后结合新安煤矿3402工作面实际情况建立几何模型,最后借助多物理场耦合模拟软件COMSOL,对煤层注水流固耦合数学模型进行计算求解。得出了各注水压力下,孔隙压力与渗流速度分布规律均为注水钻孔处最大,并以注水钻孔为中心呈椭圆状向四周递减,还得到了注水压力和注水时间与煤体渗透率的关系。
In order to investigate the distribution law of water injection pressure and permeability of coal seam under fluid-solid interaction, a mathematical model based on generalized Darcy’s law was established. Then, the geometrical model is established according to the actual situation of 3402 working face of Xin’an Coal Mine. Finally, the mathematical model of fluid-solid coupling of coal seam water injection is calculated and solved by means of multi-physics coupled simulation software COMSOL. The results show that the distribution of pore pressure and seepage velocity under water injection pressure is the largest at the water injection borehole and decreases in an elliptical shape centered on the water injection borehole. The water injection pressure, water injection time, and coal permeability Relationship.