Asfinag Baumanagement GmbH has been commissioned to construct the second tube of the Ganzstein tunnel. After completion, it will be possible to travel the entire length of the S6 expressway on dual carriageway. This investment will improve the connection of the industrial area of the Upper Steiermark with the Vienna Basin and also improve the traffic safety of the busy route. The article describes the current state of the construction works and also makes comparisons with the first tube of the tunnel, which was opened in 1980.
As part of the reorganization of the Stuttgart railway node, many tunnels had to be driven through the rock formation of gypsum Keuper (Grabfeld Formation), which contains anhydrite. In contact with water, the mineral anhydrite converts into the mineral gypsum with a resulting increase of volume. To prevent damage to the tunnel structure and the buildings above the tunnel as a result of this swelling process, the tunnelling work had to be carried out dry. No water was allowed for cleaning, drilling or for dust reduction. Dry tunnelling for hundreds of metres in this form and intensity is a novelty. There were no empirical values. In this article the special features of a dry tunnelling are presented. A target‐actual comparison or geotechnical deformations should be deliberately avoided, although some peculiarities only result from changes to the contractual framework.
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