Cutting-Caving Ratio Optimization of Fully Mechanized Caving Mining with Large Mining Height of Extremely Thick Coal Seam

Table 1

Orthogonal test scheme.

Schedule	Combination level
	Mining height (m)	Coal thickness (m)	Protodyakonov coefficient	Buried depth (m)	Support strength (MPa)
1	3.0	12	1.0	100	0.8
2	3.0	14	1.5	200	1.0
3	3.0	16	2.0	300	1.2
4	3.0	18	2.5	400	1.4
5	3.0	20	3.0	500	1.6
6	3.5	12	1.5	300	1.4
7	3.5	14	2.0	400	1.6
8	3.5	16	2.5	500	0.8
9	3.5	18	3.0	100	1.0
10	3.5	20	1.0	200	1.2
11	4.0	12	2.0	500	1.0
12	4.0	14	2.5	100	1.2
13	4.0	16	3.0	200	1.4
14	4.0	18	1.0	300	1.6
15	4.0	20	1.5	400	0.8
16	4.5	12	2.5	200	1.6
17	4.5	14	3.0	300	0.8
18	4.5	16	1.0	400	1.0
19	4.5	18	1.5	500	1.2
20	4.5	20	2.0	100	1.4
21	5.0	12	3.0	400	1.2
22	5.0	14	1.0	500	1.4
23	5.0	16	1.5	100	1.6
24	5.0	18	2.0	200	0.8
25	5.0	20	2.5	300	1.0