Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage-Damage Coupling

Table 1

MD-1 sandstone loading path and permeability statistics.

Axial compression/MPa	10.0	10.5	11	11.5	12.0	12.5	13.0	13.5	14
Confining pressure, MPa	9	9	9	9	9	9	9	9	9
Permeability, ×10^−9 mm^2	1.54	0.672	0.879	0.825	0.915	0.641	0.795	0.882	0.672
Axial compression, MPa	14.5	15.0	15.5	16.0	16.5	17	17.5	18.0	18.5
Confining pressure, MPa	8	7	6	5	5	5	5	5	5
Permeability, ×10^−9 mm^2	0.76	0.889	0.969	0.107	0.106	0.128	0.893	0.811	0.923
Axial compression, MPa	19.0	19.5	20	20.5	21.0	21.5	22.0
Confining pressure, MPa	5	4	4	4	4	4	4
Permeability, ×10^−9 mm^2	0.084	1.12	0.977	0.943	1.12	1	200