Standard Level | Well Wall Thickness/m | Compressive Strength of Concrete/MPa | Thickness of Inner Steel Plate/mm | Thickness of Outer Steel Plate/mm |
1 | 0.70 | 60 | 15 | 10 |
2 | 0.80 | 70 | 25 | 15 |
2 | 0.90 | 80 | 35 | 20 |