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  Brussels Metro North: Design and Technical Challenges

  The new fully automated metro line of Brussels connects the northern district directly with the city centre passing densely built-up areas. The project itself includes the design and structural design of seven new stations, a 4.5km long single tube tunnel with parallel tracks, a depot, a maintenance centre and auxiliary infrastructures. This paper provides an overview of the status of the project. Focus is on specific design challenges such as the passing under the railway grid of Brussels-North railway station minimising impact on the rail operation, the design of the TBM tunnel with emphasis on the settlement analysis, the interfaces between tunnel and stations and the construction of the stations. Certain stations are partially constructed directly beneath existing buildings, which require to be preserved. This involves the use of compensation grouting, ground freezing, timbered trenches, jet grouting and micro tunnelling techniques.

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