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Name of tunnel | Engineering hydrogeology | Construction requirements | Shield type selection |
Geological conditions | Permeability coefficient (cm/s) | Groundwater pressure (MPa) | Tunnel diameter (m) | Tunnel length (m) | Shield type | Cutter head |
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Zhengzhou section of the Middle Line works for the South-to-North Water Transfer Project (undercrossing the Yellow River) | Passing through a single silty loam layer, single medium sand layer, and composite stratum with sand on the top and soil at the bottom | Loam: 1 × 10−5 Sand layer: 10−3∼10−2 | About 0.4 | 8.7 | 3450 | Slurry-balanced shield | Panel-type cutter head |
Beijing railway underground connecting Line Project (undercrossing a moat) | The stratum through which the tunnel passes is predominantly cobble | Maximum: 1.74 × 10−3 | Maximum 0.3 | 11.6 | 5227 | Slurry-balanced shield | Spoke-type cutter head |
Slurry shield works in the second main line project in Shirahata of Yokohama in Japan | The stratum through which the tunnel passes is a sandy gravel layer, with the percentage content of silt and clay up to 6% | 1.0 × 10−2∼1.0 × 10−1 | — | 3.49 | 1497 | Slurry-balanced shield | Panel-type cutter head |
Interval from Qiushui Square to West Zhongshan Road for Nanchang Metro Line 1 (undercrossing the Ganjiang River) | The stratum through which the tunnel passes is a sandy cobble layer and a medium and weakly weathered politic siltstone layer | Sandy cobble: 1 × 10−1 Silt layer: 1 × 10−5 | Maximum 0.2 | 6.0 | 1889.52 (1245) | Slurry-balanced shield | Panel-type cutter head |
Interval from Wulihe to the Olympic Sports Centre Gymnasium for Shenyang Metro Line 2 (undercrossing the Hunhe River) | The stratum through which the tunnel passes is a sandy cobble layer mixed with a localized round cobble layer | 8.25 × 10−2∼1.93 × 10−1 | About 0.19 | 6.0 | 1423.45 (500) | Slurry-balanced shield | Spoke-type cutter head |
Interval from Nanning Theatre to Chaoyang Square for the Nanning Metro Line 2 (undercrossing the Yongjiang River) | The stratum through which the tunnel passes in the full section is a round cobble layer composite stratum characterized by a soft top and hard bottom and a mudstone layer | Cobble layer: 2.3 × 10−2 | — | 6.0 | 1487.3 (350) | Slurry-balanced shield | Panel-type cutter head |
Interval from Jinxiang station to Xiangban station for Fuzhou Metro Line 2 (undercrossing the Minjiang River) | The stratum through which the tunnel passes is a mucky soil layer and a medium fine sand layer | 1.45 × 10−9∼3.10 × 10−3 | Maximum 0.33 | 6.2 | 1579.9 (490) | Slurry-balanced shield | Panel-type cutter head |
Interval from Houting station to Juyuanzhou station for Fuzhou Metro Line 2 (undercrossing the Wulongjiang River) | The stratum through which the tunnel passes is a coarse and medium sand layer, cobble layer, and mucky soil layer | 3.75 × 10−5∼2.21 × 10−3 | — | 6.2 | 2619.30 (1700) | Slurry-balanced shield | Panel-type cutter head |
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