采动条件下煤体渗透率演化方程的构建及应用

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。

Construction and Application of Permeability Evolution Equation Under Mining

Based on analyzing evolution behavior of coal permeability during completely stress-strain process and strain equivalence principle,the damage model using equivalent plastic strain as variable and the permeability evolution equation using damage variable as transition variable and the permeability evolution equation was applied by method of numerical simulation.The variation of permeability of coal under the mining conditions can be expressed by the permeability equation correctly,which can provide technical support for research on coupling rule of coal seam gas seepage under mining and improving gas extraction effect.