在对煤体全应力应变过程渗透性变化规律进行分析的基础上,基于应变等价原理,构建了以等效塑性应变为变量的损伤模型和以损伤变量作为过渡变量的渗透率演化方程,并采用数值模拟的方法对渗透率演化方程进行了应用。渗透性方程能够正确地表示出采动条件下煤体的渗透性变化规律,可为采动条件下煤层瓦斯渗流耦合规律的研究和提高煤层瓦斯抽采效果提供技术支持。 Based on the analysis of the variation law of permeability during the whole stress-strain process of coal, the damage model with equivalent plastic strain as the variable and the permeability evolution equation with the damage variable as the transitional variable are constructed based on the principle of strain equivalence The permeability evolution equation is applied by numerical simulation. The permeability equation can correctly represent the changing law of permeability of coal under mining conditions, which can provide technical support for the research on the law of gas seepage coupling in coal seam under mining conditions and the improvement of gas drainage effect in coal seam.