Tunnelbau im Grenzbereich des konventionellen Tunnelvortriebs am Beispiel der Durchörterung des Bergsturzbereichs am Kramertunnel

Translated title of the contribution: Tunnel construction at the limits of conventional tunnelling using the example of working through the rockslide area at the Kramer Tunnel

Tamara Lechner

Research output: ThesisMaster's Thesis

Abstract

As part of a traffic offensive in the Werdenfelser region in Upper Bavaria, transit is being rerouted using a bypass system. Several tunnels are currently being built or planned for this purpose. The Kramer tunnel is a part of the Loisach Valley tunnel chain and forms the heart of the western route bypassing Garmisch-Partenkirchen. The bypass provides relief for local residents and motorists, but at the same time posed challenges for those involved in its construction. The route runs through a depression filled with landslide material and water, which led to a halt in the excavation work on the rescue tunnel when it was driven in 2013. Subsequently, temporary groundwater lowering was planned and implemented for the later construction of the main tunnel, but these measures proved to be insufficient. Due to the complexity and heterogeneity of the deposits, further dewatering measures and the joint development of a prototype tunnelling concept were necessary. In the course of the tunnelling construction work, an efficient package of measures was established on the basis of the planning and continuously adapted to the rock conditions with the help of specialist personnel on site. In view of these difficult conditions, landslides are not only a danger in high alpine regions, but are also a geotechnical challenge in conventional tunnelling. For this reason, some of the characteristics of these complex layers and how they are formed are also explained in more detail. On the one hand, this overview serves as an aid for the identification of rockfall deposits and, on the other hand, is intended to provide information on the layer structure in order to be able to derive the rock behaviour as realistically as possible in the future. This paper outlines the path from the original planning and the subsequent optimization to the implemented measures in coordination with the actual conditions. With the help of the comprehensive tunnelling documentation, an insight into the respective adaptation processes on site is provided. Finally, an evaluation of the measures implemented, illustrated with diagrams, shows a successful fine-tuning between economic efficiency and safety.
Translated title of the contributionTunnel construction at the limits of conventional tunnelling using the example of working through the rockslide area at the Kramer Tunnel
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Fischer, Martin, Supervisor (external), External person
  • Galler, Robert, Supervisor (internal)
Award date20 Dec 2024
Publication statusPublished - 2024

Bibliographical note

embargoed until 17-10-2029

Keywords

  • tunnelling
  • Kramer Tunnel
  • rockslide

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