Optimization and Practice for Partition Pressure Relief of Deep Mining Roadway Using Empty-Hole and Deep-Hole Blasting to Weaken Coal

Table 10

Blasting hole parameters.

Elevation (°)	Height from floor (m)	Hole depth (m)	Charge length (m)	Charge weight (kg)	Hole spacing (m)	Drilling diameter (mm)	Charge diameter (mm)
6	0.7	15	6	12	2	66	48