An Innovative Directional Blasting Technique for Coal Mine Exploration and Engineering Testing

Table 2

Observation of the effects of blast hole formation.

Blast hole	Crack section (m)	Crack distribution rate
#1	0.00~2.00	91%
	2.46~5.20
#2	0.00~2.35	89%
	2.89~5.21
#3	0.00~1.87	61%
	2.08~2.70
	3.01~3.30
	4.25~4.97