Research Article
Study on Identification of Construction Method for Ultra-Large-Span Tunnel
Table 8
Quantitative index value of tunnel stability under different factor levels.
| Level of factor | Quantitative index value of tunnel stability F | Tunnel span A | Rock strength B | Coefficient of rock integrity C |
| I | 20 | 6 | 9 | II | 17 | 12 | 12 | III | 16 | 18 | 17 | IV | 13 | 20 | 20 | V | 13 | 23 | 21 | Range | 7 | 17 | 12 |
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