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Author(s):	Schubert, Peter
Title:	Thirra Tunnel, Albania - with a straight concept to success / Thirra Tunnel Albanien - mit einem klaren Konzept zum Erfolg
Abstract:	The 5.65 km long Thirra motorway tunnel experienced major problems during the summer of 2009 in a central 1,000 m long section through a fault zone with 500 m overburden. The tunnel showed large convergence, settlement and invert heave. In early November 2009, a 60 m long section of the south tube collapsed. A team of tunnel consultants including Dr. Sauer and iC were engaged to analyze the situation and make suggestions for a modified design. This resulted in a completely new concept for re-profiling, re-mining the collapse and inner lining. The basic principles followed were optimization of the shape to near-circular, very short ring closure and stiff lining. This concept was implemented by the contracting JV at record speed and worked perfectly. The displacements of the primary lining were very small and the loads within limits. Der Thirra Autobahntunnel befand sich im Sommer 2009 im zentralen Teil mit 500 m Überlagerung in einem sehr kritischen Zustand. Über eine Länge von ca. 1.000 m waren in einer Störungszone große Konvergenzen, Setzungen und Sohlhebungen aufgetreten. Anfang November 2009 verbrach ein 60 m langer Abschnitt der Südröhre. Ein Beraterteam von Dr. Sauer und iC wurde engagiert, analysierte die Ereignisse und entwickelte ein Konzept zur Nachprofilierung, Aufarbeitung des Verbruchs und für die Innenschale des betroffenen Abschnitts. Das Konzept beruhte auf Querschnittsoptimierung, extrem kurzem Ringschluss und steifer Schale. Dieses Konzept wurde von der ausführenden ARGE in Rekordbauzeit umgesetzt und bereitete keinerlei Probleme. Die Verschiebungen in der Schale waren sehr gering, die Beanspruchungen im zulässigen Rahmen.
Source:	Geomechanics and Tunnelling 6 (2013), No. 1
Page/s:	48-56
Language of Publication:	English/German

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