Research Article
Experimental Study of Influence of Support Failures on Rockbursts under True-Triaxial Condition
Table 4
Testing results of one-single face true-triaxial unloading test with different support forces.
| | Specimen number | Support force (MPa) | σ1 when unloading σ3 (MPa) | σmax (MPa) | Dimension of the rockburst notch (cm × cm × cm) | Mass of ejected fragments (g) | Average rate of ejected fragments (m/s) | Kinetic energy of ejected fragments (J) | Average size of ejected fragments (mm) |
| | GZ-1 | 0.1 | 181.1 | 202 | 10.2 × 10.0 × 1.6 | 71.19 | 3.31 | 0.39 | 34.65 | | GZ-2 | 1 | 199.8 | 236 | 15.1 × 10.0 × 2.1 | 272.63 | 3.87 | 2.04 | 37.92 | | GZ-3 | 3 | 233.1 | 244 | 15.2 × 10.0 × 2.3 | 283.14 | 4.76 | 3.21 | 60.13 |
|
|
