Project Summary

Route Overview:

• After leaving Baiyun City Center Station, the tunnel travels north until reaching Baifang Shield Shaft.

  Tunnel Details:

  • Left-line shield tunnel: Total length of 3497.325m

  • Right-line shield tunnel: Total length of 3496.788m

  • The tunnel is constructed using 2 EPB TBMs with a diameter of 8.8 meters.

  • The tunnel has a burial depth ranging from 13.21 meters to 35 meters.

Construction Difficulties

Geological Strata:

• The tunnel primarily passes through the following strata:

  • Strongly weathered mudstone sandy shale

  • Moderately weathered mudstone sandy shale

  • Slightly weathered mudstone sandy shale

  • Strongly weathered coarse sandstone

  • Moderately weathered coarse sandstone

• Main Risks:

  • South Linggangpu Road building complex

  • 110 kV Jialong Line high-voltage power tower

  • Baiyun Five Line (high-voltage line)

  • Ultra-high-pressure gas pipelines

  • South Fang Village building complex

  • 110 kV Jialong Line high-voltage power tower

  • Liuxi River

• Screw conveyor’s stable soil removal is crucial to the construction:

  • In highly water-rich and complex geological formations, challenges such as over-excavation and unstable screw conveyor pressure can lead to severe problems.

  • If muck is not removed efficiently or over-excavation occurs, it can trigger issues such as water and sand inflow.

  • These issues can result in surface collapse, traffic disruption, building cracks, and even the burial of the TBM.