Table 4 Parameters of deep hole pre-splitting blasting.
From: Rock burst mechanisms induced by dynamic and static loading under composite key strata: a case study
Location | Hole Number | Hole depth (m) | Angle of elevation (°) | Charge quantity (kg) | Charge length (m) |
|---|---|---|---|---|---|
Mining side of roadway | F1# or J1# | 83 | 43 | 200 | 50 |
F2# or J2# | 79 | 58 | 200 | 50 | |
F3# or J3# | 69 | 75 | 180 | 45 | |
Coal pillar side of tailgate | F4# | 69 | 75 | 180 | 45 |
F5# | 70 | 54 | 180 | 45 |
