dcsimg Hard rock tunneling - Ramboll Group
      
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Hard rock tunneling

In Scandinavian hard rock conditions, most tunnels are excavated by drill & blast technique (at Triangeln Station in Sweden, for example, or in the refurbishment of Päijänne Water Tunnel, Finland). In softer rock, other excavation methods such as road headers is an alternative. 
 
 
The development of modern Tunnel Boring Machines (TBM) has made bored solutions attractive, especially for long continuous tunnels, for a variety of rock conditions. The Hallandsas project has shown how TBMs can overcome even the most challenging water-bearing, mixed ground conditions. With our home in Scandinavia, we are experienced in all types of hard rock tunneling - including continuous pre-grouting to exclude water inflows and the Q-system.The Steinberg tunnel in Trondheim, Norway: The project required adjustment to a complicated urban situation as the road had to be linked to the existing road network. In addition to this, a railway and a tramway had to be taken into consideration.
 

More information on hard rock tunneling

 
Cover of the Tunnel Engineering brochure - click to read PDF
Tunnel Engineering brochure

Tunnel Engineering brochure (PDF, 1 MB)

Contact

Stephen Whitham
Stephen Whitham
Head of Department, Tunnels
T+45 51615202
ESWHITHAM@ramboll.dk