Research Article
Temporal and Spatial Effect of Surrounding Rock and Supporting Construction of a Large Soil Tunnel
Table 1
Initial support design parameters.
| Name | Position | Parameter | Diameter/mm | Length/m |
| Hot rolled seamless steel pipe | 140° range of arch | 42 | 4.0 | Mortar bolt | Sidewall | 22 | Locking catheter | Arch foot | 42 | Connecting bar | Between adjacent arches | ɸ22 | Concrete | Initial spraying | 5 cm | Second lining arch | 50 cm | Secondary lining low side wall | 60 cm | Double lining invert | 27 cm thickness | Steel arch | Holocycle | Type I20 |
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