Effect of Initiation Location within Blasthole on Blast Vibration Field and Its Mechanism
Table 2
Computational PPVs observed along the radial direction of the cylindrical charge.
r (m)
Radial PPV (cm/s)
Vertical PPV (cm/s)
Vector PPV (cm/s)
A
B
O
AB
A
B
O
AB
A
B
O
AB
2
16.15
14.58
15.58
15.49
7.59
5.55
6.87
6.53
17.84
15.60
17.03
16.81
5
8.09
7.36
7.78
7.82
7.75
6.66
7.35
7.43
11.20
9.93
10.70
10.79
10
3.11
2.96
3.12
3.12
3.80
3.54
3.74
3.78
4.91
4.61
4.87
4.90
15
2.23
2.15
2.25
2.26
1.96
1.87
1.95
1.97
2.97
2.85
2.98
3.00
20
1.71
1.68
1.74
1.75
1.06
1.03
1.07
1.07
2.01
1.97
2.04
2.05
30
1.17
1.17
1.19
1.19
0.43
0.42
0.43
0.43
1.25
1.24
1.27
1.27
40
0.89
0.89
0.90
0.90
0.24
0.24
0.24
0.24
0.92
0.92
0.93
0.93
50
0.71
0.71
0.72
0.72
0.15
0.15
0.15
0.15
0.73
0.73
0.74
0.74
60
0.59
0.59
0.60
0.60
0.10
0.10
0.10
0.10
0.60
0.60
0.61
0.61
70
0.51
0.51
0.52
0.52
0.08
0.08
0.08
0.08
0.52
0.52
0.53
0.53
80
0.45
0.45
0.45
0.45
0.06
0.06
0.06
0.06
0.45
0.45
0.45
0.45
100
0.40
0.40
0.40
0.40
0.05
0.05
0.05
0.05
0.40
0.40
0.40
0.40
The letters A, B, O, and AB, respectively, denote bottom initiation, top initiation, midpoint initiation, and two-end initiation. The vector PPV denotes the synthesis of the radial and vertical PPVs.
