Research Article
Characteristics and Mechanical Mechanism of In Situ Unloading Damage and Core Discing in Deep Rock Mass of Metal Mine
Table 4
Ratio of maximum principal stress to rock tensile strength at different buried depths.
| | Position | Lithology | Max principal (MPa) | Tensile strength (MPa) | Stress intensity ratio | Whether cake crack occurs |
| | Xincheng gold mine (12010 m) | Biotite monzogranite | 46 | 7 | 6.57 | Yes | | Sanshandao gold mine(1200 m) | Biotite monzogranite | 46 | 10 | 4.6 | No | | Hanging wall of Sanshandao gold mine (1800 m) | Biotite monzogranite | 66 | 10 | 6.6 | Yes | | Footwall of Sanshandao gold mine (1800 m) | Granodiorite | 66 | 15 | 4.4 | No |
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