A Study on Cut Blasting with Large Diameter Charges in Hard Rock Roadways

Table 9

Comparative data of blasting effects.

No.	Cut blasting with small diameter charge		Cut blasting with large diameter charge
	Footage (m)	Utilization rate of blast hole (%)	Footage (m)	Utilization rate of blast hole (%)
1	1.95	81.3	2.20	91.7
2	1.90	79.2	2.20	91.7
3	1.90	79.2	2.15	89.6
4	1.90	79.2	2.25	93.8
5	1.85	77.1	2.15	89.6
6	1.90	79.2	2.20	91.7
7	1.95	81.3	2.25	93.8
8	1.85	77.1	2.20	91.7
9	1.85	77.1	2.15	89.6
10	1.90	79.2	2.25	93.8
11	1.95	81.3	2.20	91.7
12	1.90	79.2	2.20	91.7
Average	1.90	79.2	2.20	91.7