Table 2 Construction parameters of 21,201 air return roadway roof pre-splitting blasting.
From: Investigation of the mechanism and application of pressure relief roadway in preventing rock burst
Position | Hole depth, m | Hole inclination,° | Charge length, m | Sealing length, m | Charge quantity, kg | Spacing, m |
|---|---|---|---|---|---|---|
Stope | 46 | 30 | 30 | ≥ 16 | 90 | 20 |
Wall | 45 | 45 | 30 | ≥ 15 | 90 | 20 |
