Table 1 Main lining support parameters of the tunnel.
From: Analysis and treatment of invert uplift in a long span tunnel in weak mudstone
Type | Surrounding rock classification | Initial support | Secondary lining | Deformation allowance | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Sprayed concrete (cm) | Anchor bar (m) | Reinforcement Mesh | Steel frame distance | Arch wall (cm) | (mm) | |||||
Arch Wall | Inverted arch | Position | Length | Spacing | (mm) | (cm) | ||||
SF5a | Ⅴ2 | 29 | 29 | Arch wall | 3.5 | 1.0 × 0.6 | 8@150 × 150 (Double, arch, wall) | 60 (I22b) | 60cmC30 WRC | 150 |
SF5b | Ⅴ1 | 27 | 27 | 4.0 | 1.0 × 0.7 | 70 (I20b) | 60cmC30 WRC | 120 | ||
SF5c | (V*) | 29 | 29 | 4.5 | 1.0 × 0.6 | 60 (I22b) | 70cmC30 WRC | 150 | ||
SF4a | Ⅳ3 | 25 | 25 | 3.5 | 1.0 × 0.8 | 80 (I18) | 55cmC30 WRC | 120 | ||
SF4b | Ⅳ2 | 25 | – | 3.5 | 1.0 × 1.0 | 8@200 × 200 (Double, arch, wall) | 100 (I18) | 50cmC30 WRC | 100 | |
