Research Article
Mechanism of Strain Burst by Laboratory and Numerical Analysis
Table 5
Results of strain burst tests for different specimens.
| | Lithology | Number of tests | Sampling spots | Mean Young’s modulus (GPa) | Stiffness (GN/m) | Stiffness ratio | Strain burst intensity |
| | Peridotite | 2 | Garson mine | 60.1 | 0.72 | 0.75 | Strong | | Dolomite | 7 | Heishiling tunnel | 52.7 | 0.63 | 0.82 | Strong | | Granite | 20 | Laizhou | 51.0 | 0.61 | 0.85 | Strong | | Marble 1 | 13 | Jingpin II tunnel | 43.1 | 0.52 | 1.01 | Moderate | | Basalt | 3 | Baijiao coal mine | 42.8 | 0.51 | 1.01 | Moderate | | Sandstone | 8 | Xingcun coal mine | 39.1 | 0.47 | 1.11 | Moderate | | Limestone | 3 | Jiahe coal mine | 36.7 | 0.44 | 1.18 | Moderate | | Fine sandstone | 6 | Antaibao coal mine | 29.0 | 0.35 | 1.49 | Light | | Marble 2 | 7 | Jingpin I tunnel | 25.0 | 0.30 | 1.73 | Light | | Sandy mudstone | 4 | Antaibao coal mine | 22.9 | 0.27 | 1.89 | No burst | | Shale | 4 | Jiahe coal mine | 15.2 | 0.18 | 2.85 | No burst | | Slate | 4 | Tengchong tunnel | 13.5 | 0.16 | 3.21 | No burst |
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