Table 6 Design scheme and parameters.
Scheme | Roof cutting | Steel composite pillar support | Top cutting parameter/mm | Parameters of concrete-filled steel tube pillar/mm | |||||
|---|---|---|---|---|---|---|---|---|---|
Diameter | Length | Angle | Spacing | Diameter | Thickness | Height | |||
Plan A | None | None | – | – | – | – | – | – | – |
Plan B | Yes | None | 65 | 11,000 | 35 | 6000 | – | – | – |
Plan C | None | Yes | – | – | – | – | 299 | 10 | 2600 |
Plan D | Yes | Yes | 65 | 11,000 | 35 | 6000 | 299 | 10 | 2600 |
