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

Table 11

Estimated values and relative errors of the permeability under complete stress-strain process.

State	Permeability (m^-2)
	Experimental values	Single-step estimated values	Relative error (%)	Multistep estimated values	Relative error (%)
			—		—
			2.55%		4.21%
			0.61%		4.13%
			1.76%		3.88%
			7.60%		5.01%
			6.40%		3.96%
			1.04%		4.05%