Application and Development of an Environmentally Friendly Blast Hole Plug for Underground Coal Mines

Table 5

Drilling pattern and charge weight in 2415 roadway.

Hole name	Number	Hole depth (m)	Angle (°)		Total charge (kg)	Firing sequence	Connection way	Filling way
			Horizontal	Vertical
Cut hole	1–6	2.0	73	90	1.0 × 6	1	Series	Fully filled
Auxiliary hole holes	7–10	1.8	90	90	0.8 × 4	2
Trim hole	11–24	1.8	83	83	0.6 × 14	3
Bottom hole	25–31	1.8	83	83	0.6 × 7	4
Total	31				21.8