Hard rock tunneling

Contact

Stephen Whitham

Stephen Whitham

Global Division Unit Manager, Tunnels
T: +45 51615202
Richard Miller. Ramboll

Richard Miller

Director Ground Engineering & Tunnelling
T: +44 7436 269130

Ramboll has comprehensive and long-term experience of tunnelling in Scandinavia, where the geology is characterised by hard rocks such as gneiss, greenstone and granite. Our expertise covers all types of hard rock tunnelling methods including continuous pre-grouting to exclude water inflow, blasting, boring, post-grouting and using the Q-system.

Drill and blast

Most of the tunnels we work on in Scandinavian hard rock conditions are excavated using drill and blast techniques. Examples of our drill and blast projects are Triangeln Station in Sweden — part of the Malmö rail tunnel project — and the refurbishment of Päijänne Water Tunnel in Finland.

Other methods

Where the rock is soft enough not to require blasting, Ramboll’s tunnel designs use alternative excavation methods such as road headers and tunnel boring machines (TBMs). Modern TBMs are ideal for long continuous tunnels that contain a variety of rock conditions.

The Hallandsås tunnel project in western Sweden has shown how TBMs can overcome even the most challenging water-bearing mixed ground conditions. In places, the saturated rock had to be frozen before a TBM could be deployed. We provided digital modelling, non-destructive testing and audit advice for the 8.7km railway tunnel.

Q-system

Ramboll’s designs for tunnelling through rock take account of the Q-system, which describes the quality and stability of the rock mass and evaluates the tunnel supports required.
The Q-system was developed at the Norwegian Geotechnical Institute, and has been updated periodically to relate to current practice.

More information on hard rock tunneling

Tunnel Engineering brochure


Tunnel Engineering brochure (PDF, 1 MB)

Projects

Päijänne Water Tunnel

Refurbishment of Päijänne Water Tunnel

Supervision of the refurbishment of the worlds’ longest rock tunnel that carries water to the capital of Finland. Finland’s Päijänne Water Tunnel (constructed in 1972) is the world’s longest continuous rock tunnel and provides Helsinki and surrounding cities with pure water from Lake Päijänne in central Finland.

Steinberg

The Steinberg tunnel

Ramboll has been an advisor in planning the new Steinberg tunnel near the city centre of 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.

THE WEST LINK UNITES GOTHENBURG

The population in Western part of Sweden is growing and capacity problems on the railways in and around Gothenburg are increasing.

E 18 rock tunnel in Norway

E18 Grimstad-Kristiansand

Ramboll is engaged as the main consultant on the stretch of the new E18 motorway between Grimstad and Kristiansand. The new motorway will significantly improve the Norwegian infrastructure and will improve living conditions for local communities living along the existing road.

Päijänne Water Tunnel

Refurbishment of Päijänne Water Tunnel

Supervision of the refurbishment of the worlds’ longest rock tunnel that carries water to the capital of Finland. Finland’s Päijänne Water Tunnel (constructed in 1972) is the world’s longest continuous rock tunnel and provides Helsinki and surrounding cities with pure water from Lake Päijänne in central Finland.

THE WEST LINK UNITES GOTHENBURG

The population in Western part of Sweden is growing and capacity problems on the railways in and around Gothenburg are increasing.

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Ramboll

Ramboll
240 Blackfriars Road
London SE1 8NW
United Kingdom
Tel: +44 20 7631 5291
Fax +44 845 299 1610

Mail: london@ramboll.co.uk

Company registration

Company registration

Ramboll UK Limited. Registered in England & Wales. Company registration no. 03659970. Registered office: 240 Blackfriars Road, London SE1 8NW


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