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  U5 East in Hamburg: Geotechnical aspects for separation into homogeneous areas

  Germanys northern metropole, Hamburg, has big plans to alleviate traffic congestion. Among others, a new 20 km subway line U5 is planned that will connect Hamburg's northwest and northeast with the city center. The first phase of the U5 subway line – U5 East– were commenced in 2021 and will have a length of around 6 km. The soil in the alignment of the U5 East consists of different heterogeneous layers, partly fine grained, partly coarse grained. For the construction of the planned tunnel with a length of around 3.4 km in these challenging soils a TBM will be used. The description of the soil and its geotechnical parameters has changed in the last years in Germany, so that the soil has to be separated into so called “homogeneous areas”. Based on a range of geotechnical parameters homogeneous areas describe sections with almost same interaction of the TBM and the soil. In this paper the project U5 East will be presented including the leading subsoil parameters of different layers. The methodology of the separation of the soil into homogeneous areas will be shown.

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