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Details of the effects of karst on different positions of tunnel floor.
| Case | L | R | U | B | Monitoring site (x-coordinate) |
|---|---|---|---|---|---|
| 1 | − 38 | 52 | 2 | 22 | 0.5, 1, 1.5, 2, …, 13.5 |
| 2 | 3 | 23 | 0.5, 1, 1.5, 2, …, 13.5 | ||
| 3 | 4 | 24 | 0.5, 1, 1.5, 2, …, 13.5 | ||
| 4 | 5 | 25 | 0.5, 1, 1.5, 2, …, 13.5 |
