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Abstract:	The selection of the correct method of tunnelling from the contractor's point of view mostly depends on its chance to survive the competition of the marketplace, in addition to a host of technical constraints. The tendering and award conditions also decisively influence whether the technically and economically optimal solution is chosen. There are also other factors like the market situation, availability of suitable tunnelling machinery and personnel resources, which can have a significant effect on the decision process. Die Wahl der aus Sicht des Unternehmers richtigen Vortriebsmethode hängt neben einer Vielzahl technischer Randbedingungen vor allem davon ab, wie dieser damit im Wettbewerb bestehen kann. Dabei beeinflussen die Ausschreibungs- und Vergabebedingungen ganz wesentlich, ob letztlich auch die technisch und wirtschaftlich optimale Lösung zur Ausführung gelangt. Daneben sind es aber auch Faktoren wie Marktsituation, Verfügbarkeit von geeigneten Vortriebsanlagen, Personalressourcen, die im Entscheidungsprozess der Vortriebsmethode eine gravierende Rolle spielen können.
Source:	Geomechanics and Tunnelling 4 (2011), No. 4
Page/s:	327-336
Language of Publication:	English/German

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