Experimental Investigation on Permeability and Mechanical Deformation of Coal Containing Gas under Load

Table 2

Test parameters of average effective stress-seepage velocity.

Specimen no.	Gas pressure (MPa)	Average effective stress,		Residual effective stress,
		(MPa)	(mL/min)	(MPa)	(mL/min)
W1	1	20.60	0.384	9.78	1.512
W2		25.19	0.032	15.16	0.035
W3		32.56	0.030	17.77	0.034
W4	2	20.91	0.577	12.29	3.496
W5		18.54	0.015	11.98	0.132
W6		27.38	0.161	18.44	0.274