Optimization and Practice for Partition Pressure Relief of Deep Mining Roadway Using Empty-Hole and Deep-Hole Blasting to Weaken Coal

Table 5

Statistical analysis of orthogonal test results.

No.	Factor					(m)	(MPa)	(mm)
					Error
1	90	12	1	0	1	9.02	29.93	157.59
2	90	15	2	5	2	9.70	30.71	152.68
3	90	18	3	10	3	9.40	32.38	149.35
4	90	20	4	15	4	9.70	32.20	149.12
5	100	12	2	15	3	10.41	29.84	165.72
6	100	15	1	10	4	10.51	28.18	168.36
7	100	18	4	5	1	9.59	31.50	157.59
8	100	20	3	0	2	9.81	30.10	160.12
9	110	12	3	5	4	9.39	27.91	168.20
10	110	15	4	0	3	10.21	28.26	165.98
11	110	18	1	15	2	10.91	25.90	176.14
12	110	20	2	10	1	11.32	26.51	171.69
13	120	12	4	10	2	10.00	27.65	178.15
14	120	15	3	15	1	11.00	25.55	179.32
15	120	18	2	0	4	11.21	24.41	183.57
16	120	20	1	5	3	11.79	23.98	187.53
KL1	9.46	9.71	10.56	10.06	10.23
KL2	10.08	10.36	10.66	10.12	10.11
KL3	10.46	10.28	9.90	10.31	10.45
KL4	11.00	10.66	9.88	10.51	10.20
Range	1.55	0.95	0.79	0.44	0.35
KL1	31.30	28.83	26.99	28.18	28.37
KL2	29.90	28.18	27.87	28.53	28.59
KL3	27.15	28.55	28.98	28.68	28.61
KL4	25.40	28.20	29.90	28.37	28.18
Range	5.91	0.66	2.91	0.50	0.44
KL1	152.19	167.42	172.40	166.82	166.55
KL2	162.95	166.59	168.41	166.50	166.77
KL3	170.50	166.66	164.25	166.89	167.15
KL4	182.14	167.11	162.71	167.58	167.31
Range	29.96	0.83	9.69	1.08	0.77