The relationship among permeability, strain and stress of rock is discussed for both brittle and plastic fracture based on the permeability-strain curve and permeability-stress curve obtained from the permeability test under complete stress-strain path. The results of coupling behavior of permeability of rock with stress before peak pressure show that permeability and stress is obvious. A formula is proposed to show the behavior of permeability expressed with increasing of stress. In addition, a characteristic parameter of stress is proposed to indicate critical anti-permeability strength of rock with corresponds to the stress causing permeability strengthening distinctly. And an example of application of the characteristic parameter is also given to evaluate water-insulating capability.
Chinese Journal of Rock Mechanics and Engineering