Gas Seepage Model and Experiment Based on Bedding Effect of Fractured Coal Body

Table 3

Permeability of vertical bedding direction coal samples during the loading and unloading process.

	Effective stress, σe (MPa)	Permeability, k (mD)			Effective stress, σe (MPa)	Permeability, k (mD)
		Coal sample, V1	Coal sample, V2			Coal sample, V1	Coal sample, V2
Loading process	1.75	0.01787	0.02056	Unloading process	11.75	0.00432	0.00494
	3.75	0.01226	0.01421		10.42	0.00514	0.00591
	5.75	0.00932	0.01072		9.08	0.00565	0.00651
	7.75	0.00763	0.00879		7.75	0.00635	0.00732
	9.75	0.00594	0.00684		6.42	0.00737	0.00841
	11.75	0.00432	0.00494		5.08	0.00866	0.00991