煤样三维渗透率应力敏感性试验研究

目前国内三维渗透率测试研究处于起步阶段，利用自主研发的煤样三维渗透率测试仪，可以模拟实现真实三向应力状态下流体通过立方体煤样孔隙的三维渗流，并进行真实三向应力条件下煤样渗透率应力敏感性试验研究。试验结果表明，真实三向应力作用下煤样水平最大主应力对煤样水平方向渗透性的影响程度大于水平最小主应力；煤样三维渗透率对三向应力的敏感程度不同，对垂直应力的敏感性最强，水平最大主应力次之，水平最小主应力最小。 

The experimental study on stress sensitivity of three dimensional permeability of coal

At present, the research on 3D permeability test is in the initial stage in China. Based on the self-developed 3D permeability tester for coal samples, we can simulate the three dimensional fluid flow through pores of coal samples under the triaxial stress. The experiments of stress sensitivity of the permeability of coal samples were conducted under triaxial stress. The study shows that the impact of horizontal maximum principle stress on percolation ability of coal samples is larger than horizontal minimum principle stress; the three dimensional permeability of coal samples is sensitive to the stress in different directions, the strong-to-weak sequence of sensitivity is:the vertical stress>horizontal maximum principle stress>horizontal minimum principle stress.