三轴应力作用下煤渗透率变化规律实验

Experimental Study of the Law for Permeability of Coal under Action of 3-Triaxial Compression

通过变化的围压和孔隙压力的作用 ,进行含瓦斯煤三轴压缩的实验 ,系统地研究了含瓦斯煤在变形过程中渗透率的变化规律 ;并根据大量的实验数据 ,拟合得到含瓦斯煤的渗透率随围压和孔隙压力变化的经验方程。研究结果表明 ,该经验方程可应用于双层系统煤层变形与煤层气越流耦合模型的数值分析 ,使邻近层 (采空区 )

The 3-triaxial compression tests to coal sample containing methane gas are carried out with various confining pressure and pore pressure in this paper.The law for gas permeability of the coal samples due to coal compressional deformations is systematically studied by the tests. The new equations for gas permeability of the coal samples are formulated by the numerical simulations of experimental data. It is found that the equations for gas permeability of coal sample can be applied to the numerical simulations of the models for coupled coalseam deformation and methane gas leak flow in a two-layer coalseam system, and the numerical simulation result for gas drainage from coal mining goafs is closer to reality.