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.

Keywords: Rock mechanics, Post-failure behaviour, Non-Darcy flow, Confining pressure, Permeability, Laboratory research,

Submitted on July 24, 2020.
Final Acceptance on June 03, 2015.
Discussion open until July 24, 2020.
DOI: 10.28927/SR.382181