Simulation Analysis on Water’s Micro Seepage Laws under Different Pressure Gradients Using Computed Tomography Method

Table 3

Average seepage velocities in coal seams under different pressure gradients.

Pressure increase (MPa)	Inlet pressure (MPa)	Pressure gradient (10^9 MPa·m^−1)	Average seepage velocities in coal’s different regions (m·s^−1)
			P1	P2	P3	P4
0.2	0.3	3.93	1.01	1.24	1.18	0.95
	0.5	7.97	1.77	2.22	2.11	1.70
	0.7	12.14	2.40	3.07	2.91	2.30
	0.9	16.52	2.95	3.82	3.65	2.83
	1.1	21.16	3.44	4.53	4.39	3.32
	1.3	26.77	3.98	5.19	5.35	3.79
0.4	1.7	35.36	4.92	6.12	6.13	4.70
	2.1	45.31	5.72	7.15	7.19	5.48
	2.5	53.26	6.46	8.14	7.55	6.01
	2.9	62.47	7.14	9.04	8.42	6.31
	3.3	71.88	7.79	9.68	9.21	6.91
	3.7	82.88	8.36	10.71	9.99	7.49
0.6	4.3	99.06	9.21	11.95	11.12	8.32
	4.9	113.87	10.02	12.63	12.20	9.11
	5.5	130.78	10.8	13.75	13.25	9.85
	6.1	148.37	11.52	14.85	14.31	10.59
	6.7	161.51	12.24	16.27	15.37	11.31
	7.3	174.18	13.05	17.14	16.24	12.01
0.8	8.1	196.07	13.98	18.01	17.35	12.92
	8.9	230.39	14.95	18.94	18.42	13.82
	9.7	259.86	15.84	20.84	19.45	14.66
	10.5	285.29	16.69	21.98	20.45	15.52
	11.3	310.44	17.54	23.10	21.41	16.08
	12.1	339.06	18.39	24.20	22.35	17.37
1.0	13.1	373.47	19.39	25.55	23.48	18.39
	14.1	407.36	20.44	26.88	24.58	19.06
	15.1	443.90	21.48	28.20	25.64	19.90
	16.1	480.27	22.40	29.50	26.68	20.72
	17.1	518.03	23.38	30.80	27.67	21.52
	18.1	556.90	24.35	32.11	28.66	22.30