Research Article
Reasonable Treatment Range of Karst Cave Encountered by Super-Large Diameter Shield Tunnel in Strongly Karst-Developed Area
Table 1
Treatment range of shield tunnel with a diameter of about 6 m.
| Engineering case | Tunnel outer diameter (m) | Karst cave development | Treatment range |
| Shield tunnel of Guangzhou metro line 9 (data from Qian [14]) | 6 | There are 132 karst caves, including 93 unfilled karst caves, 39 half filled and fully filled karst caves | |
| Shield tunnel of Nanning metro line 3 (data from Xie [19]) | 6 | There are 178 karst caves, including five unfilled karst caves, 66 half filled karst caves, and 107 fully filled karst caves | |
| Shield tunnel of Shenzhen metro line 16 (data from Zhang [20]) | 6.2 | There are 258 karst caves, including 220 unfilled karst caves, 38 half filled and fully filled karst caves | |
| Shield tunnel of Kunming metro line 4 (data from Liu et al. [21]) | 6.2 | There are 219 karst caves, including 44 unfilled and half filled karst caves and 175 fully filled karst caves | |
| Shield tunnel of Wuhan metro line 27 (data from Zhang [22]) | 6.2 | There are 536 karst caves, including 241 unfilled karst caves, 130 half filled karst caves, and 165 fully filled karst caves | |
| Shield tunnel of Changsha metro line 3 (data from Ma [23]) | 6.2 | There are 89 karst caves, including 14 unfilled karst caves, 75 half filled and fully filled karst caves | |
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