Experimental Investigation on Sandstone Permeability under Plastic Flow: Permeability Evolution Law with Stress Increment

Table 7

Strain increment and permeability increment during plastic flow of the rock sample.

Step	(%)	(%)		State
	2.10	3.66		Unloading
	-0.27	-0.25		Unloading
	-0.20	0.05		Loading
	0.11	-0.16		Unloading
	0.00	0.15		Loading
	-0.18	-0.96		Unloading