Application of Presplitting Blasting Technology in Surrounding Rock Control of Gob-Side Entry Retaining with Hard Roof: A Case Study

Table 2

Parameters of blasting presplitting roof.

Design parameters	Parameter value
	Deep hole blasting	Shallow hole blasting
Distance from borehole to stope	200 mm	200 mm
Direction of drilling	Vertical to the center line of the roadway and inclined to the stope
Inclination of borehole	80°	80°
Depth of borehole	17800 mm	6000 mm
Diameter of borehole	50 mm	50 mm
Spacing of boreholes	600 mm	600 mm