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  Copenhagen Cityringen Project: Passage with minimum cover under historical building - compensation and jet grouting as mitigation measures and TBM operation

  The Cityringen project will form a new circular line in the city centre and will consist of 21 new stations and approx. 31 Km of EPB twin-bored tunnels. The Kongens Nytorv passage is one if not the most delicate in the project. After launching from Kongens Nytorv station, the TBMs cross the existing metro tunnels, passing above them with a clearance of just 1.5 m, to immediately dive underneath the Magasin du Nord complex. This is a series of historic building comprising the Magasin du Nord itself, which is an upscale department store, the McDonalds and two other old and vulnerable buildings in the heart of the city with a minimum cover of about 4 m. The geology, mixed face soft ground and presence of boulders, complicates mining operation and controls. To minimize the movements a mitigation measures package was adopted consisting of the underpinning of McDonalds foundations by jet grout columns and a compensation-grouting scheme performed from a shaft.

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