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Author(s):	Vassilakopoulou, Georgia; Rizos, Dimitris; Vrettos, Christos
Title:	Metro Thessaloniki: Tiefe Baugruben in Deckelbauweise
Abstract:	Die neue U-Bahn in Thessaloniki befindet sich seit 2006 im Bau. Mit einer Streckenlänge von 9, 6 km umfasst sie, neben dem Schildvortrieb zweier Röhren, die Errichtung von 13 Bahnhöfen mit zentralem Bahnsteig. Zur Reduzierung von Verkehrsstörungen und zur Begrenzung der Setzungen in der Nachbarschaft wurde eine Deckelbauweise mit Schlitzwänden gewählt. Wegen der engen Platzverhältnisse musste dabei auf eine Innenschale verzichtet werden. Weitere erschwerende Randbedingungen sind der weiche inhomogene Untergrund, die große Aushubtiefe im Grundwasser und die Seismizität am Standort. Beginnend mit der Projektbeschreibung werden für zwei typische Bahnhöfe die erdstatischen Nachweise und die Maßnahmen zur dauerhaften Auftriebssicherung zusammengefasst sowie gemessene und prognostizierte Systemverformungen gegenübergestellt. Thessaloniki Metro: Deep excavations by the top-down method. The new Thessaloniki Metro has been under construction since 2006. The total length of 9.6 km includes, beside the excavation of two tunnels, the construction and support of deep excavations for 13 stations with central platforms. In order to reduce traffic disturbance and to minimize settlements in the neighbourhood, a top-down construction method with diaphragm walls was adopted. Due to the limited space availability, stations were constructed without an inner lining. Further difficulties are associated with the soft inhomogeneous subsoil, the large excavation depths below the groundwater level and the seismicity at the site. Starting with a project description, the paper briefly presents the geotechnical design for two typical stations and the measures taken for providing safety against uplift. Measured and predicted system responses are also compared.
Source:	geotechnik 34 (2011), No. 4
Page/s:	291-296
Language of Publication:	German

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