A Cowi and Multiconsult JV have taken 1.4 km of core samples between Oslo and Fornebu for one of Norway’s largest metro projects.
When completed the new 8.2km Fornebu Line will connect the centre of Fornebu peninsula to Majorstuen in Oslo by underground tunnel. Six new stations will also be built.
Drilled down to 140m, in ten locations, the samples are currently being looked at by a group of engineering geologists
Cowi engineering geologist Laura Smids Arneson said: “It’s a time-consuming process. We open each box, look at the lithology and the geology, and study every single crack to see if it’s a natural crack or a mechanical fracture. But everything is just an engineering challenge. You find out what you’ve got and you engineer around that.”
Cowi’s analyses will reveal any cracks and anomalies that could cause water leaks and the result of the core logging forms the basis for the safety level in the tunnel.
Want to know more about the ground investgation? Watch this video.
The NOK13bn (£1.2bn) project is due to be completed in 2025 and is said to be Norway’s largest infrastructure project for over 20 years.
The Cowi and Multiconsult JV was awarded the contract last September.