Groundwater: For Tunneling, It’s All about Control

Groundwater will go where it wants to go and will exert hydrostatic pressure at the most inconvenient locations. Effective groundwater control is, therefore, one of the key factors to a successful tunneling project.

Case Study on Retrofitting

Retrofitting Seattle's Mount Baker Ridge and Mercer Island Tunnels using a Saccardo Nozzle.

Tunnel Segment Gaskets: Cast vs. Non-cast

Trelleborg explains how, by using gaskets that are pre-cast into the tunnel segment during manufacture, installers can save time and money.

Choosing the Right Pump or Gunite Machine

A concrete pump and a gunite machine are work tools that can help a contractor turn a nickel’s worth of concrete material into a dime, a quarter or even a dollar using the wet or dry shotcrete process.

Ground Improvement for Groundwater Control

Whether the need for ground improvement is known in advance or unexpected, the techniques available are the same. However, the approach to the work is different.

Tunnel Shaft Dewatering Dealing with Stratified Soils Below the Water Table

Advancing a tunnel shaft is akin to an archeological dig. The process is relatively slow with the support structure advancing plate by plate with the excavation. When the shaft is completely above the water table this is a rhythmic process with few hiccups. Even if the shaft is below the water table and the...

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