Table 3 Structural parameters of outer wellbore.
Mine | Depth (m) | Grade of concrete | Inner radius (mm) | Outer radius (mm) | Inner reinforcement ratio(%) | Outer reinforcement ratio(%) |
|---|---|---|---|---|---|---|
Main shaft | 391–430 | C60 | 5250 | 6300 | 0.528 | 0.481 |
430–490 | C70 | 5250 | 6550 | 0.562 | 0.538 | |
490–545 | C75 | 5250 | 6550 | 0.604 | 0.573 | |
Auxiliary shaft | 400–420 | C65 | 5000 | 6000 | 0.682 | 0.667 |
420–480 | C65 | 5200 | 6250 | 0.722 | 0.709 | |
480–544 | C70 | 5200 | 6250 | 0.750 | 0.696 | |
Air shaft | 400–430 | C65 | 5050 | 6450 | 0.652 | 0.684 |
430–490 | C65 | 5050 | 6450 | 0.738 | 0.705 | |
490–538 | C70 | 5100 | 6500 | 0.756 | 0.732 |
