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 2

Preliminary design parameters for deep-hole presplit blasting.

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	1#	20	40	75	10	28	12	29
	2#	30	30	75	10	20	10	24
	3#	45	25	75	10	17	8	20