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Keller Group
Tunneling and shaft construction projects require careful management of ground behavior to protect workers, equipment, and overlying structures. Variable subsurface conditions, restricted access, and tight tolerance requirements make constructability and settlement control central to project success.
Keller works with tunneling contractors and project teams to deliver geotechnical construction solutions that stabilize ground conditions, support excavation, and manage risk throughout underground construction.
Geotechnical construction solutions for tunnels and shafts
Keller provides a full range of geotechnical construction solutions for tunneling operations using an integrated design-build approach focused on constructability and performance.
Our work includes soil stabilization to support tunneling activities, earth retention systems for break-in and break-out shafts, and ground improvement methods designed to control the settlement of structures above active tunneling operations. These solutions help maintain excavation stability and protect adjacent infrastructure during underground construction.
Keller’s teams coordinate closely with tunneling contractors to sequence work efficiently and respond to changing ground conditions as excavation progresses.
Keller’s experience in tunneling operations
Keller has supported tunneling projects for more than four decades, serving as a trusted partner to tunneling contractors across North America. Our experience spans a wide range of subsurface conditions and project settings, from urban environments to complex underground corridors.
This depth of experience allows Keller to deliver reliable geotechnical solutions that help project teams manage subsurface risk, maintain production, and achieve safe, predictable performance throughout tunneling operations.
Sector challenges we can solve
- Stabilizing soil for tunneling operations
- Earth retention for break-in and break-out shafts
- Controlling the settlement of structures above tunneling activities
- Working in constrained underground environments
- Managing subsurface risk during active excavation
Related projects
Infrastructure
West Lynn Sewer Separation Phase 3
With the increasing severity of weather events and urbanization leading to higher water flows, sewer system improvements are consistently underway to increase capacity. In West Lynn, the installation of a 54-inch force main was underway when Keller was contacted to formulate a ground improvement solution to allow for the safe installation.
Tunnels and shafts
Boston Central Artery Tunnel
Three tunnels were to be created beneath seven active Amtrak lines serving Boston’s South Station and the financial district.
Tunnels and shafts
Eastside CSO
The East Side Combined Sewer Outflow (CSO) Tunnel project consisted of the construction of approximately 29,000 linear feet of tunnel, seven shafts and multiple pipe-line connections.
Tunnels and shafts
Port of Miami Tunnel
The Port of Miami Tunnel project consisted of a twin tunnel bored through the coral below the Port of Miami, Florida.
Mining
Kansas Underground Salt Museum
The Hutchinson salt mine is an active salt mine in the United States with an underground museum open to the public. Ground freezing ensured dry and stable excavation of the new elevator shaft.
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