Pore Damage Properties and Permeability Change of Coal Caused by Freeze-Thaw Action of Liquid Nitrogen

Table 2

Initial information of coal rock samples.

	1	2	3	4	5	6	7	8	9	10	11	12	13
Sound velocities (m/s)	1378	1467	1408	1397	1469	1486	1519	1397	1436	1468	1501	1430	1459
Initial permeability (10^−15 m^2)	0.093	0.0945	0.0986	0.0943	0.091	0.1	0.0925	0.099	0.097	0.0915	0.0913	0.0921	0.09
Water saturation (%)	0	34.2	67.8	92.4	0	0	0	10.9	31.8	48.2	68.7	81.4	100