Experimental Research on the Impact of Confining Pressure on the Permeability Characteristics of Non-Darcy Flow in Post-failure Rocks

H. Xu, Y. Zhao, W. Bu

Technical Note

Soils and Rocks, São Paulo, 38(2): 181-187, May-August, 2015 | PDF


Abstract

Researches on the impact of the confining pressure on the permeability characteristics of non-Darcy flow in rocks during the post-failure behaviour plays a significant role in the instability of the non-Darcy flow systems. The permeability characteristics of non-Darcy flow under different confining pressures is studied using a patented device combined with the MTS815.02. The experimental data indicates that the permeability rate of the non-Darcy flow decreases with the increasing in the confining pressure and this relationship can be fitted by an exponential function, while the absolute value of the β factor of non-Darcy flow increases with the increasing in the confining pressure and the relationship can be fitted by a logarithmic function.


Submitted on November 21, 2012; Final Acceptance on June 3, 2015; Discussion open until December 31, 2015.