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

Table 2

Permeability of parallel 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, P1	Coal sample, P2			Coal sample, P1	Coal sample, P2
Loading process	1.75	0.09396	0.10814	Unloading process	11.75	0.00156	0.00182
	3.75	0.04329	0.04864		10.42	0.00192	0.00243
	5.75	0.02491	0.03096		9.08	0.00262	0.00314
	7.75	0.01414	0.01631		7.75	0.00363	0.00428
	9.75	0.00784	0.01002		6.42	0.00463	0.00528
	11.75	0.00156	0.00182		5.08	0.00511	0.00612