Research Article
Energy Evolution and Acoustic Emission Characteristics of Sandstone Specimens under Unloading Confining Pressure
Table 2
Strain energy at peak strength points or the rock specimen under unloading confining pressure.
| Initial value σ3 (MPa) | Peak value σ3 (MPa) | σ1–σ3 (MPa) | U1 (kJ·m−3) | U3 (kJ·m−3) | Ue (kJ·m−3) | Ud (kJ·m−3) |
| 5 | 3.32 | 96.82 | 375.50 | −46.80 | 262.82 | 69.13 | 10 | 4.53 | 117.22 | 590.30 | −118.46 | 363.89 | 123.48 | 15 | 6.86 | 141.33 | 848.59 | −183.33 | 517.71 | 171.20 | 20 | 10.58 | 156.21 | 1003.50 | −225.64 | 636.65 | 176.46 |
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