Research Article
Influence of Utility Tunnel on the Lower Part of the Existing Double-Track Shield Tunnel in Loess Soil
Table 3
Parameters of structures of metro tunnel and utility tunnel.
| | Name | Bulk density (kN/m3) | Elasticity modulus (MPa) | Poisson’s ratio | Thickness (m) |
| | Shield | 463.84 | 2.10E + 05 | 0.30 | 0.04 | | Segment | 25 | 2.84E + 04 | 0.20 | 0.3 | | Grouting (early) | 23 | 0.9 | 0.30 | — | | Grouting (late) | 23 | 400 | 0.2 | — | | Soil-nailed wall | 22 | 2.18E + 04 | 0.2 | | | Soil nailing | 78.5 | 2.00E + 05 | 0.3 | | | Cushion | 23 | 2.60E + 04 | 0.2 | | | Corridor | 25 | 3.15E + 04 | 0.2 | |
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“—” means that the grouting layer completely fills the gap at the shield tail, without a fixed thickness.
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