围压对含裂隙茅口灰岩渗透率的影响

取煤炭坝茅口灰岩制作成圆柱体试样，分析围压对含裂隙茅口灰岩渗透率的影响.基于MTS多功能岩石试验系统，研究了同一轴压不同围压作用下，含裂隙茅口灰岩渗透率的变化情况.实验结果表明，同一轴压作用下，试样渗透率随围压的增大而减少，其中低围压作用下渗透率变化比较敏感，高围压作用下渗透率变化缓慢，指数函数较好地拟合体积应力、渗透系数和渗透压之间的关系.

Influence of Confining Pressure over Permeability of Fractured Maokou Limestone

The impact of confining pressure on the permeability of fractured Maokou limestone. Maokou limestone sample was cored from coal dam was analyzed MTS815 rock mechanical system was used to re- search the permeability under different confining pressures and the same axial pressure. The test results showd that permeability decreased with confining pressure increase under the same axial pressure, and when confining pressure was low, permeability of fractured Maokou limestone changed largely with con- fining pressure increase; on the contrary, the permeability changed relatively little when confining pressure was high. Volumetric stress, permeability coefficient and osmotic pressure were fitted well by exponential function.