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.

Holmestrand station, Norway

Contact

Stephen Whitham

Market Director, Tunnels

T: +45 5161 5202

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.

More information on hard rock tunneling

Tunnel Engineering brochure

Tunnel Engineering brochure (PDF, 1 MB)

Projects

Ramboll is responsible for planning and design of the stretch of tunnel from Söder Mälarstrand to Södra Station on the Stockholm City Line and for designing tunnel ventilation, general ventilation as well as smoke and heat ventilation.

The Stockholm City Line: Efficient travel across the city

Ramboll is giving expert advice in how to build a railway tunnel, and how to improve the punctuality and the frequency of future rail traffic in Stockholm.

E18 Grimstad - Kristiansand, European Highway

Ramboll was 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.

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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