Research Article

Shield Equipment Optimization and Construction Control Technology in Water-Rich and Sandy Cobble Stratum: A Case Study of the First Yellow River Metro Tunnel Undercrossing

Table 2

Comparison of similar engineering projects.

Name of tunnelEngineering hydrogeologyConstruction requirementsShield type selection
Geological conditionsPermeability coefficient (cm/s)Groundwater pressure (MPa)Tunnel diameter (m)Tunnel length (m)Shield typeCutter head

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 bottomLoam: 1 × 10−5
Sand layer: 10−3∼10−2
About 0.48.73450Slurry-balanced shieldPanel-type cutter head
Beijing railway underground connecting Line Project (undercrossing a moat)The stratum through which the tunnel passes is predominantly cobbleMaximum: 1.74 × 10−3Maximum 0.311.65227Slurry-balanced shieldSpoke-type cutter head
Slurry shield works in the second main line project in Shirahata of Yokohama in JapanThe 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 × 10−13.491497Slurry-balanced shieldPanel-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 layerSandy cobble: 1 × 10−1
Silt layer: 1 × 10−5
Maximum 0.26.01889.52 (1245)Slurry-balanced shieldPanel-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 layer8.25 × 10−2∼1.93 × 10−1About 0.196.01423.45 (500)Slurry-balanced shieldSpoke-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 layerCobble layer: 2.3 × 10−26.01487.3 (350)Slurry-balanced shieldPanel-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 layer1.45 × 10−9∼3.10 × 10−3Maximum 0.336.21579.9 (490)Slurry-balanced shieldPanel-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 layer3.75 × 10−5∼2.21 × 10−36.22619.30 (1700)Slurry-balanced shieldPanel-type cutter head