Tunnelling under the city centre of Antwerp: a new underground railway link for the HSL Paris-Brussels-Amsterdam
2006
The most important structure of the Antwero north-south railway link, situated on the high speed line Paris-Brussels-Amsterdam, is definitely the twin-tube tunnel of 1,225m length and 8.00m diameter which has bored in dense – slightly silty – sands, under the old city centre, between the “Koningin Astrid” and the “Dam” squares. During the design hase, as well as during the construction phase of the tunnel, constant care was taken to limit subsidence in this sensitive urban area. This required the combination of traditional underground construction techniques, such as galleries, “sheeted trenches”, grout injections, pipe-jacked roof, jacked tubes . . . with the boring process itself using a slurry type Tunnel Boring Machine (TBM).
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