Numerical Analysis of Dynamic Responses of Rock Containing Parallel Cracks under Combined Dynamic and Static Loading
Table 6
DRC calculation results and dynamic initiation SIFs (DISs) of crack tip.
Model number
SIF (State A) (MPa m1/2)
SIF (State B) (MPa m1/2)
SIF (State C) (MPa m1/2)
SIF (State D) (MPa m1/2)
DRC (State B)
DRC (State C)
1
3.21
7.76
8.05
9.16
2.42
2.51
2
3.24
7.33
7.56
9.27
2.26
2.33
3
3.29
7.22
7.42
9.42
2.19
2.25
4
3.38
7.08
7.35
9.59
2.11
2.19
5
3.41
6.73
7.14
9.71
1.98
2.10
6
3.44
6.47
6.95
9.88
1.87
2.01
7
3.48
6.42
6.80
9.91
1.85
1.96
8
3.25
7.15
7.35
9.23
2.20
2.26
9
3.28
7.08
7.28
9.33
2.16
2.22
10
3.23
7.20
7.46
9.25
2.23
2.31
11
3.18
7.92
8.20
9.07
2.49
2.58
12
3.15
7.88
8.13
9.02
2.50
2.58
13
3.14
7.91
8.26
8.95
2.52
2.63
14
3.33
7.59
7.89
9.47
2.28
2.37
15
3.42
7.22
7.63
9.89
2.11
2.23
16
3.21
7.51
7.93
9.22
2.34
2.47
17
3.28
7.38
7.87
9.35
2.25
2.40
18
3.34
7.05
7.45
9.51
2.11
2.23
19
3.41
6.92
7.40
9.76
2.03
2.17
20
3.52
6.84
7.23
10.07
1.94
2.05
State A: axial pressure and lateral static confining pressure both reach preset value before dynamic load is applied. State B: dynamic load lasts for 1.0 s (). State C: dynamic load lasts for 1.5 s (). State D: tip begins to crack.
