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Abstract:	Major tunnel projects like the new Semmering Base Tunnel require intensive design work long before construction can start. Design work is based on basic surveying, which is subject to particular requirements on major projects of engineering geodesy. The most important basis is a homogeneous and stress-free basic control network for position and height, represented by suitable stabilised points. The conception and implementation of this basic control network poses stringent requirements for the surveyor. On the one hand, great precision and reliability are required, and on the other hand design requirements have to be considered along with the numerous geodetic and geophysical considerations. The most challenging work, which has to be undertaken above ground for the later tunnelling works, is described in detail in this article Große Tunnelbauvorhaben wie der neue Semmering Basistunnel erfordern bereits lange vor der Realisierung intensive Planungsarbeiten. Grundlage für alle Planungstätigkeiten sind Vermessungsgrundlagen, an die bei ingenieurgeodätischen Großprojekten besondere Anforderungen gestellt werden. Die wichtigste Basis ist ein homogenes und spannungsfreies Grundlagennetz in Lage und Höhe, das durch geeignet stabilisierte Punkte repräsentiert wird. Die Konzeption und Realisierung dieses Grundlagennetzes stellt hohe Anforderungen an den Vermessungsingenieur. Zum einen ist höchste Präzision und Zuverlässigkeit gefordert, zum anderen sind neben zahlreichen geodätischen und geophysikalischen Rahmenbedingungen auch Vorgaben aus der Projektierung zu berücksichtigen. Die herausfordernden Arbeiten, die bei der übertägigen Grundlagenvermessung für den späteren Tunnelvortrieb notwendig sind, werden in diesem Beitrag ausführlich dokumentiert.
Source:	Geomechanics and Tunnelling 6 (2013), No. 6
Page/s:	713-724
Language of Publication:	English/German

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