Research Article
Reasonable Treatment Range of Karst Cave Encountered by Super-Large Diameter Shield Tunnel in Strongly Karst-Developed Area
Table 3
Spatial relationship between karst cave and tunnel.
| | Location of karst cave | Number of caves | Percentage (%) |
| | Intrude into the tunnel | 387 | 52.4 | | Within 7.25 m above the tunnel roof | 147 | 19.9 | | Outside 7.25 m above the tunnel roof | 69 | 9.3 | | Within 7.25 m below the tunnel floor | 89 | 12.0 | | Within 7.25–14.5 m below the tunnel floor | 39 | 5.3 | | Outside 14.5 m below the tunnel floor | 8 | 1.1 |
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