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Abstract:	Bei der Abdichtung von bergmännisch aufgefahrenen Tunneln mit einer Kunststoffdichtungsbahn (KDB) kommt es nach Wiederanstieg des Bergwasserspiegels immer wieder zu Undichtigkeiten, da die KDB dabei gegen potenzielle Fehlstellen an der Außenseite der Innenschale gedrückt wird. Da diese nicht gänzlich vermieden werden können, erfolgt in den Nachbarländern Österreich und Schweiz nach dem dortigen Regelwerk planmäßig eine vollflächige Zementinjektion zwischen KDB und Betoninnenschale (Blockhinterlegung). In Deutschland ist hingegen nach den gültigen Regelwerken planmäßig bisher nur eine Verpressung in der Firste und die Installation eines zusätzlichen Prüf- und Injektionssystem vorgesehen. Befürworter dieses Systems führen an, dass eine Blockhinterlegung nachträglich keine direkte Kontrolle eventueller Wasserzutritte mehr erlaube und daher weniger Augenmerk auf die Herstellqualität der Innenschale gelegt würde. Der vorliegende Beitrag stellt die beiden Vorgehensweisen zur Diskussion. Block injection for tunnel sealing - State of the art or call for negligence When sealing tunnels excavated by mining operations with a waterproofing geomembrane (GM), leakages occur repeatedly after the mountain water level has risen again, as the KDB presses against potential defects on the outside of the concrete inner shell. Since these defects cannot be completely avoided, cement injection between the GM and the concrete inner liner (block injection) is carried out in the neighbouring countries of Austria and Switzerland according to the rules and regulations and thus the state of the art there. In Germany, on the other hand, according to the applicable rules and regulations, only one grouting in the roof ridge and the installation of an additional testing and injection system is carried out as planned. Proponents of this system argue that a block injection does not allow for a later direct control of possible water ingress and and therefore less attention is paid to the manufacturing quality of the inner shell. The paper presents both approaches for discussion.
Source:	geotechnik 43 (2020), No. 3
Page/s:	201-213
Language of Publication:	German

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