Coal Burst Induced by Horizontal Section Mining of a Steeply Inclined, Extra-Thick Coal Seam and Its Prevention: A Case Study from Yaojie No. 3 Coal Mine, China

Table 4

Design parameters for destress blasting in coal masses.

Blasting agent	Number	Angle (°)	Length of borehole (m)	Diameter of borehole (mm)	Distance between boreholes (m)	Stemming length (m)	Explosive charge length (m)	Explosive charge weight (kg)
Emulsion explosive	4#	0	15	42	5	8	7	8
	5#	30	10	42	5	5	5	5
	6#	70	10	42	5	5	5	5
	7#	70	10	42	5	5	5	5