Research Article
Joint Investigation and 3D Visual Evaluation of Rock Mass Quality
Table 5
Effect of initial stress state on correction factor K3.
| | Surrounding rock strength stress ratio | BQ | | >550 | 550∼451 | 450∼351 | 350∼251 | ≤250 |
| | <4 | 1.0 | 1.0 | 1.0∼1.5 | 1.0∼1.5 | 1.0 | | 4∼7 | 0.5 | 0.5 | 0.5 | 0.5∼1.0 | 0.5∼1.0 |
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