Analysis on the Influence Degree of Deformation Control Factors of Deep-Buried Roadway’s Fractured Surrounding Rock Using Orthogonal Design

Table 2

The orthogonal table of control factors L₉ (3⁴).

No.	Main control factors
	Bolt length (Lb, m)	Row spacing between bolts (Db, m × m)	Cable length (Lc, m)	Row spacing in U-shaped steel (Du, m)
T1	2.0	0.6 × 0.6	5	0.4
T2	2.0	0.8 × 0.8	7	0.7
T3	2.0	1.0 × 1.0	9	1.0
T4	2.5	0.6 × 0.6	7	1.0
T5	2.5	0.8 × 0.8	9	0.4
T6	2.5	1.0 × 1.0	5	0.7
T7	3.0	0.6 × 0.6	9	0.7
T8	3.0	0.8 × 0.8	5	1.0
T9	3.0	1.0 × 1.0	7	0.4