Table 5 Parameters for blasting calculations for side aperture diameter-oriented charging structures.

From: Optimization of large-diameter deep-hole stope blasting technology based on numerical simulation: a case study of the Dongguashan copper mine

Model number

d1/mm

d2/mm

k2

β/%

a/cm

Original

165

140

1.18

42

250

1

165

140

1.18

33

250

2

165

140

1.18

25

250

3

165

140

1.18

33

250

4

165

140

1.18

28

250

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