Surrounding Rock Stability Classification Method of Coal Roadway Based on In Situ Stress

Table 7

Support scheme before and after optimization of No.3302 roadway.

Type of surrounding rock	Support way		Support parameters
			Primary support	Reinforced support
Roof	Anchor bolt	Diameter/mm	20	20
		Length/mm	2400	2200
		Spacing/mm	800 × 1000	700 × 700
Rib	Anchor bolt	Diameter/mm	20	20
		Length/mm	2200	2200
		Spacing/mm	800 × 1000	700 × 700
	Anchor cable	Diameter/mm	17.8	17.8
		Length/mm	7000	7000
		Spacing/mm	1000	1000