Research on Seepage Properties and Pore Structure of the Roof and Floor Strata in Confined Water-Rich Coal Seams: Taking the Xiaojihan Coal Mine as an Example

Table 3

Total stress-strain permeability test data.

(mm)	1 of K (×10^−11 m·s^−1)	2 of K (×10^−13 m·s^−1)	3 of K (×10^−12 m·s^−1)	4 of K (×10^−13 m·s^−1)	5 of K (×10^−13 m·s^−1)	6 of K (×10^−13 m·s^−1)	7 of K (×10^−12 m·s^−1)	8 of K (×10^−11 m·s^−1)
0.2	0.29	0.39	1.18	0.18	0.13	0.23	2.81	1.23
0.35	0.37	0.52	3.44	0.41	0.34	0.96	5.72	11.44
0.45	2.13	0.39	6.32	0.33	0.37	0.37	7.16	27.45
0.5	7.13	0.92	8.76	0.51	0.49	0.64	11.65	29.75
0.55	4.86	1.17	11.27	1.12	1.13	1.22	12.97	34.62
0.6	9.22	1.13	14.11	1.17	1.57	1.53	14.28	40.53
0.65	22.75	1.45	16.15	1.36	1.66	2.11	15.21	67.42
0.7	55.52	2.11	20.3	1.43	2.13	3.37	14.35	259.48
0.75	142.16	8.36	73.97	11.97	1.97	3.74	61.33	143.25
0.85	95.88	15.99	18.85	13.85	15.35	20.15	24.25	135.51
1	72.36	75.86	17.34	18.67	55.33	64.47	20.33	133.28
1.2	68.56	36.68	17.45	65.54	32.66	31.73	18.85	132.35
1.4	62.44	32.36	16.89	37.89	27.73	26.82	17.25	132.15
1.5	60.18	32.11	16.68	34.82	25.26	26.34	17.17	130.59

: axial displacement; K: permeability coefficient.