Case Study on the Stability Control of Broken Surrounding Rock in Roadway Excavation on the Edge of a Collapsed Stope Area

Table 1

Summary of grouting drilling arrangement parameters.

Numbering	Orifice position (m)	Hole number	Drilling angle (°)	Drill length (m)
1	Y1; H = −240	ZK1	−6.0	21.0
		ZK2	−31.0	25.0
		ZK3	−53.0	35.0
2	Y2; H = −240	ZK1	−6.0	26.0
		ZK2	−24.0	35.0
		ZK3	−39.0	34.0
		ZK4	−53.0	43.0
3	Y3; H = −240	ZK1	20.0	26.0
		ZK2	0.0	34.0
		ZK3	−16.0	43.0
4	Y4; H = −40	ZK1	28.0	25.0
		ZK2	0.0	35.0
		ZK3	−29.0	34.0
		ZK4	−64.0	43