Tunnel portal

Geofrost provides stabilization by freezing so tunnel excavation can start directly in the soils outside the rock, minimizing environmental footprint. The freezing pipes are installed from the surface into the rock where normal tunnel excavation can continue. Issues avoided:

• Impacting landscape and natural groundwater levels.
• Removal of buildings in affected zone.
• Slope stability problems.
• Excavation of large volumes that need to be transported, deposited and potentially brought back and laid out on top of the cut and cover portal.
• Rerouting of roads and other infrastructure crossing the area.