Mechanism and Application of Static Fracturing Technology on Deep Working Face

Table 4

Orthogonal test program.

Serial number	Factor
	Hole diameter A (mm)	Hole spacing B (cm)	Hole depth C (m)
1	42	40	2
2	42	50	4
3	42	60	6
4	42	70	8
5	50	40	4
6	50	50	6
7	50	60	8
8	50	80	2
9	60	40	6
10	60	50	8
11	60	70	2
12	60	80	4