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Author(s):	Nagel, F.; Stascheit, J.; Meschke, G.
Title:
Abstract:	A numerical simulation model for the analysis of shield-supported tunnelling processes based on the finite element method is presented. The process-oriented computational representation of the tunnel drive enables forecasts of the effects of different tunnelling process parameters, like support and grouting pressures or the advance rate, on ground deformations and stresses, groundwater conditions or the loading of the shield machine and segment lining. This requires, in addition to the realistic numerical modelling of the sequential tunnelling process, the supporting measures and the surrounding ground, to employ adequate numerical models to describe the intricate interactions between the ground and the tunnelling process resulting from the face support, the contact between shield skin and ground, the shield tail grouting, the steering of the machine and the lining. These process-oriented interactions determine the structural behaviour above and behind the machine to a considerable degree. Selected numerical applications demonstrate the capabilities of the simulation model described here for the analysis of interaction mechanisms in mechanical tunnelling. Der vorliegende Beitrag präsentiert ein auf der Methode der Finiten Elemente basierendes Simulationsmodell zur Analyse schildgestützter Tunnelvortriebsprozesse. Die prozessorientierte Abbildung des Tunnelvortriebs ermöglicht Prognosen der Auswirkungen unterschiedlicher Vortriebsparameter, wie Stütz- und Verpressdrücke oder der Vortriebsgeschwindgkeit, auf die Bodenverformungen und -beanspruchungen, die Grundwasserverhältnisse oder die Belastungen von Schildmaschine und Tübbingausbau. Dies erfordert neben der wirklichkeitsnahen numerischen Abbildung des sequentiellen Vortriebsprozesses, der Prozesskomponenten und des umgebenden Baugrunds adäquate numerische Modelle zur Beschreibung der vielfältigen Boden- Prozess-Interaktionen infolge der Ortsbruststützung, des Kontakts zwischen Schildmantel und Baugrund, der Schildschwanzverpressung, der Maschinensteuerung und des Ausbaus. Diese prozessabhängigen Wechselwirkungen prägen das strukturmechanische Verhalten vor, über und hinter der Tunnelvortriebsmaschine in erheblichem Umfang. Ausgewählte Beispielrechnungen demonstrieren die Möglichkeiten des vorgestellten Simulationsmodells für die Analyse von Interaktionsmechanismen im maschinellen Tunnelvortrieb.
Source:	Geomechanics and Tunnelling 3 (2010), No. 3
Page/s:	268-282
Language of Publication:	English/German

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