Langzeitüberwachung von Eisenbahntunneln

At the large infrastructure projects of the Austrian Federal Railways in the Alpine region geotechnical structures with different characteristics are encountered. Especially heterogeneity and composition of fault zones associated with different stress conditions are a great challenge during tunnelling. Although the system behaviour resulting from ground-support interaction is measured by monitoring methods, after completion of tunnel works with installation of the inner lining usually the tunnel is no further monitored. The goal of ÖBB-Infrastructure AG is to apply robust, reliable and durable monitoring systems for the observation of geotechnical relevant structures during a service life of the tunnels of 150 years. Thereby unfavourable tendencies of system behaviour shall be detected early and measures in terms of predictive maintenance planned in due time to ensure high availability of the tunnels during operation. The paper presents the implementation of long-term monitoring at the projects Koralm Tunnel and Granitztal Tunnel and gives an outlook at the Semmering Base Tunnel.