Ramboll has wide-ranging experience in all types of soft ground tunnelling, designing tunnels for many different purposes. We often work in sensitive urban environments, where settlement as a result of tunnelling through soft ground would be a major concern. We understand that each tunnel is uniquely important to the client.
A range of techniques
Ramboll’s tunnel engineers are skilled in using a comprehensive variety of techniques from tunnel boring machines (TBMs) with segmental linings to sprayed concrete linings (SCL), also known as the New Austrian Tunnelling Method (NATM), applied to pre-excavated tunnels.
We were involved in the design of a large diameter bored tunnel in the Nordhavn (North Harbour) area of Copenhagen, and had to choose between using an earth pressure balance or a slurry shield TBM.
For projects in areas of specific sensitivity — whether physical or political — we use our experience to prepare impact assessment studies. An example is the urban Crossrail project in London, routed through areas of potential ground movement.
Tunnels large and small
Tunnels come in all shapes and sizes. Ramboll is concerned with the design of tunnels large and small, especially in Denmark.
On the macro scale, our team of experts worked on the cut and cover road tunnels of Nordhavnsvej in Copenhagen and Marselis Boulevard in Aarhus, and the bored tunnel of Nordhavnen Metro in Copenhagen. At the other end of the spectrum, we are involved in a micro-tunnelling project at Hvidovre.