The central problem with tunnelling in karstified rock mass is the karst structures, which can be empty, partially or completely filled. The filling can consist of soil, water or a combination of both. Before the start of tunnelling in the Steinbühl Tunnel, a section of the new DB line between Stuttgart and Ulm, the various structures had to be expected at any time. The associated risks could be reduced through good work preparation, high qualitative investigation measures and good miners and engineers. The geotechnical aspects of tunnelling were of great significance, from the tunnel excavation to the provision of a durable lining.
This paper deals with the boundary conditions regarding layout, geotechnics and economics required to make a full‐face excavation of a tunnel. A flowchart for decision‐making leads to four different excavation sequences. Unsuitable geometrical conditions and very unfavourable geotechnical conditions exclude full‐face excavation. Under other boundary conditions, a full‐face excavation may show economic advantages, which should be further exploited in our region.Dieser Artikel beurteilt die grundsätzlichen Randbedingungen für einen Vollausbruch hinsichtlich Layout, Geotechnik und Wirtschaftlichkeit. Ein Flussdiagramm der Entscheidungsfindung führt zu vier unterschiedlichen Vortriebsabläufen. Ungünstige geometrische Randbedingungen und sehr ungünstige geotechnische Verhältnisse führen zum Ausschluss eines Vollausbruchs. Unter den anderen Randbedingungen jedoch kann der Vollausbruch wirtschaftliche Vorteile bringen, die in unseren Breiten mehr als bisher genutzt werden sollten.
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