Table 3 Roof pre-splitting parameters for the 10204 gob-side entry retained.
Parameters | Value |
|---|---|
Pre-splitting depth | 20 m |
Dip to the goaf angle | 15° |
Borehole spacing | 500 mm |
Borehole diameter | 50 mm |
Explosive type | No.3 emulsion explosive |
Charge quantity in a single borehole | 11.7 kg |
Detonation method | Indirect priming |
Sealing length | 3.5 m |
Explosive quantity in a sound | 117 |
