Experimental Study on the Influence of Confining Pressure on Non-Darcy Flow Permeability in Post-failure Rocks
Hui Xu1,2,3*, Yucheng Zhao1,2, Wankui Bu1,3
1: State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining & Technology, Xuzhou, Jiangsu 221008, China
The research on the impact of confining pressure on the non-Darcy flow permeability in post-failure rocks plays a significant role in the instability of non-Darcy flow system in post-failure rocks. On the basis of a patented device combined with MTS815.02 Rock Mechanical System, the non-Darcy flow permeability under different confining pressures are presented. The experimental data indicates that the permeability rate of non-Darcy flow decreases with the increasing of the confining pressure which could be fitted by exponential function, while the absolute value of ß factor of non-Darcy flow increases with the increasing of the confining pressure, which could be fitted by logarithmic function.
Keywords: post-failure rock; non-Darcy flow; confining press; permeability; experiment
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