Experimental and Numerical Study on Hydromechanical Coupled Deformation Behavior of Beishan Granite considering Permeability Evolution

Table 3

Permeability evolution under different pore pressures.

Sample	Pore pressure (MPa)	Permeability/
		1st^a	2nd	3rd	4th	5th	6th	7th	8th
HM-1	2	5.8	2.78	4.91	6.5	20.29(p^b)	22.71	22.89	25.49
HM-2	4	1.29	0.51	0.38	1.14(p)	3.04	3.74	5.38	—
HM-3	6	0.95	0.29	0.48	1.3	2.46	5.85	10.7(p)	32.78
HM-4	8	2.29	1.48	1.77	3.84	7.03	11.51	13.17(p)	26.16

^a”1st” represents the first time to measure permeability. ^b”P” represents the permeability measured around peak stress.