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  Ground Treatment in Soft Ground Tunneling for the High Speed Railway in the Lower Inn Valley, Austria – Part 1

  For the upgrading of the Lower Inn Valley Railway Line in Tyrol, Austria, a new double-track High Speed Railway (HSR) was built close to the existing line. Approx. 80% of this new line runs in mined tunnels, cut & cover tunnels and in trough structures. The crossing of the A12 motorway, the existing railway line and the Inn River was required several times. This 40 km stretch was divided in 10 construction lots. Owing to the geological and hydrological conditions in most of the construction lots, special construction methods using extensive ground treatment for soil improvement and/or to reduce permeability were required. As a subsequence, technically challenging jet grouting works had to be carried out during mined tunnel construction. So for the first time horizontal jet grouting umbrellas were installed as an advanced support under compressed air conditions.

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