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.

NumberAxial prestress (MPa)Prepeak energy accumulation (J·m−3)Unsteady release rate of postpeak energyNumberLoading methodPrepeak energy accumulation (J·m−3)Unsteady release rate of postpeak energy

Dynamic compressiveStatic compressive
B-100.818762.1 × 103Z1Uniaxial compression0.392065.2 × 104
B-200.911541.1 × 103Z2Uniaxial compression0.332035.1 × 104
C-700.898842.5 × 103Z3Uniaxial compression0.409081.8 × 104
F-101.278062.8 × 103Z4Uniaxial compression0.344791.2 × 104
F-300.199082.9 × 103Z5Uniaxial compression0.304132.1 × 105
F-400.10171.7 × 103Z6Uniaxial compression0.424562.5 × 106
D-100.792441.1 × 103F1Uniaxial compression0.107325.2 × 103
D-340% σc0.756661.7 × 103F2Uniaxial compression0.102019.0 × 103
D-440% σc0.491321.0 × 103F3Uniaxial compression0.114664.1 × 104
D-540% σc0.377961.3 × 103F4Uniaxial compression0.123715.5 × 104
E-140% σc1.252331.4 × 103F6Uniaxial compression0.189635.0 × 103
E-240% σc1.229931.8 × 103N1Uniaxial compression0.112531.2 × 104
E-340% σc1.478782.1 × 103N2Uniaxial compression0.114521.6 × 104
E-440% σc0.864127.5 × 102N3Uniaxial compression0.122173.3 × 104
E-740% σc1.084441.1 × 103N4Uniaxial compression0.085085.4 × 103

Dynamic tensileStatic tensile
A-100.023.2 × 102S1Brazil split0.004422.8 × 102
A-300.034631.0 × 103S2Brazil split0.004821.9 × 102
A-600.04415.7 × 102S3Brazil split0.002362.2 × 102
A-700.012723.0 × 102Dynamic tensile
B-430% σt0.030153.2 × 103C-160% σt0.005956.0 × 101
B-530% σt0.018092.9 × 102C-260% σt0.023535.2 × 102
B-630% σt0.007721.5 × 102C-560% σt0.010234.0 × 102
B-730% σt0.045531.1 × 103C-660% σt0.028014.6 × 102