Research Article
Failure Behavior and Energy Storage and Release of Hard Coal under Different Static and Dynamic Loading States
Table 2
Calculation results of energy accumulation and release rate under different loading states of coal.
| Number | Axial prestress (MPa) | Prepeak energy accumulation (J·m−3) | Unsteady release rate of postpeak energy | Number | Loading method | Prepeak energy accumulation (J·m−3) | Unsteady release rate of postpeak energy |
| Dynamic compressive | Static compressive | B-1 | 0 | 0.81876 | 2.1 × 103 | Z1 | Uniaxial compression | 0.39206 | 5.2 × 104 | B-2 | 0 | 0.91154 | 1.1 × 103 | Z2 | Uniaxial compression | 0.33203 | 5.1 × 104 | C-7 | 0 | 0.89884 | 2.5 × 103 | Z3 | Uniaxial compression | 0.40908 | 1.8 × 104 | F-1 | 0 | 1.27806 | 2.8 × 103 | Z4 | Uniaxial compression | 0.34479 | 1.2 × 104 | F-3 | 0 | 0.19908 | 2.9 × 103 | Z5 | Uniaxial compression | 0.30413 | 2.1 × 105 | F-4 | 0 | 0.1017 | 1.7 × 103 | Z6 | Uniaxial compression | 0.42456 | 2.5 × 106 | D-1 | 0 | 0.79244 | 1.1 × 103 | F1 | Uniaxial compression | 0.10732 | 5.2 × 103 | D-3 | 40% σc | 0.75666 | 1.7 × 103 | F2 | Uniaxial compression | 0.10201 | 9.0 × 103 | D-4 | 40% σc | 0.49132 | 1.0 × 103 | F3 | Uniaxial compression | 0.11466 | 4.1 × 104 | D-5 | 40% σc | 0.37796 | 1.3 × 103 | F4 | Uniaxial compression | 0.12371 | 5.5 × 104 | E-1 | 40% σc | 1.25233 | 1.4 × 103 | F6 | Uniaxial compression | 0.18963 | 5.0 × 103 | E-2 | 40% σc | 1.22993 | 1.8 × 103 | N1 | Uniaxial compression | 0.11253 | 1.2 × 104 | E-3 | 40% σc | 1.47878 | 2.1 × 103 | N2 | Uniaxial compression | 0.11452 | 1.6 × 104 | E-4 | 40% σc | 0.86412 | 7.5 × 102 | N3 | Uniaxial compression | 0.12217 | 3.3 × 104 | E-7 | 40% σc | 1.08444 | 1.1 × 103 | N4 | Uniaxial compression | 0.08508 | 5.4 × 103 |
| Dynamic tensile | Static tensile | A-1 | 0 | 0.02 | 3.2 × 102 | S1 | Brazil split | 0.00442 | 2.8 × 102 | A-3 | 0 | 0.03463 | 1.0 × 103 | S2 | Brazil split | 0.00482 | 1.9 × 102 | A-6 | 0 | 0.0441 | 5.7 × 102 | S3 | Brazil split | 0.00236 | 2.2 × 102 | A-7 | 0 | 0.01272 | 3.0 × 102 | Dynamic tensile | B-4 | 30% σt | 0.03015 | 3.2 × 103 | C-1 | 60% σt | 0.00595 | 6.0 × 101 | B-5 | 30% σt | 0.01809 | 2.9 × 102 | C-2 | 60% σt | 0.02353 | 5.2 × 102 | B-6 | 30% σt | 0.00772 | 1.5 × 102 | C-5 | 60% σt | 0.01023 | 4.0 × 102 | B-7 | 30% σt | 0.04553 | 1.1 × 103 | C-6 | 60% σt | 0.02801 | 4.6 × 102 |
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