Study on In Situ Stress Measurement and Surrounding Rock Control Technology in Deep Mine

Table 5

Orthogonal programming table.

Number	Bolt pretension	Length of anchor cable	Pretightening force of anchor cable	Number	Bolt pretension	Length of anchor cable	Pretightening force of anchor cable
1	20	3.6	50	19	80	3.6	200
2	20	4.8	100	20	80	4.8	250
3	20	6.0	150	21	80	6.0	300
4	20	7.2	200	22	80	7.2	50
5	20	8.4	250	23	80	8.4	100
6	20	9.6	300	24	80	9.6	150
7	40	3.6	100	25	100	3.6	250
8	40	4.8	150	26	100	4.8	300
9	40	6.0	200	27	100	6.0	50
10	40	7.2	250	28	100	7.2	100
11	40	8.4	300	29	100	8.4	150
12	40	9.6	50	30	100	9.6	200
13	60	3.6	150	31	120	3.6	300
14	60	4.8	200	32	120	4.8	50
15	60	6.0	250	33	120	6.0	100
16	60	7.2	300	34	120	7.2	150
17	60	8.4	50	35	120	8.4	200
18	60	9.6	100	36	120	9.6	250