Table 2 Test results of coal rock under different strain rates.
Test | Confining pressure/MPa | Strain rate/s-1 | Peak strength | Elastic modulus | Peak strain % | ||
|---|---|---|---|---|---|---|---|
Numerical value/MPa | Reduction rate/% | Numerical value/GPa | Reduction rate/% | ||||
Uniaxial compression | 0 | 1 × 10–5 | 13.33 | 3.29 | 0.45 | ||
0 | 1 × 10–4 | 7.39 | 44.5 | 2.05 | 37.6 | 0.53 | |
0 | 1 × 10–3 | 4.88 | 33.9 | 1.45 | 29.2 | 0.47 | |
Triaxial compression | 8 | 1 × 10–5 | 22.16 | 3.42 | 0.65 | ||
8 | 1 × 10–4 | 33.08 | − 49.2 | 3.67 | − 7.3 | 1.13 | |
8 | 1 × 10–3 | 17.84 | 45.9 | 3.16 | 13.8 | 0.57 | |
12 | 1 × 10–5 | 26.28 | 3.51 | 0.82 | |||
12 | 1 × 10–4 | 40.21 | − 53.1 | 3.99 | − 13.6 | 1.51 | |
12 | 1 × 10–3 | 22.21 | 44.7 | 3.46 | 13.2 | 0.68 | |
16 | 1 × 10–5 | 51.45 | 4.98 | 1.32 | |||
16 | 1 × 10–4 | 60.83 | − 18.2 | 5.34 | − 7.2 | 1.88 | |
16 | 1 × 10–3 | 40.21 | 33.9 | 4.62 | 13.4 | 0.93 | |
