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Author(s):	Hollmann, Fritz; Thewes, Markus
Title:	Evaluation of the tendency of clogging and separation of fines on shield drives / Bewertung der Neigung zur Verklebungsbildung und zur Feinkornfreisetzung bei Schildvortrieben
Abstract:	Shield drives in fine-grained clay soils are often associated with clogging. The tendency of soils to clog depends on numerous parameters. The separation of fines out of the cohesive soil structure also often leads to negative effects. Whether a certain clay soil can become critical depends not only on the soil properties but also the hydrogeological and operating conditions. According to the quantity of water available (groundwater, support fluid), the soil can be altered to a critical consistency range. An evaluation diagram, which takes into account possible changes of water content during the tunnel drive, can be used to evaluate soils under changing conditions (change of available water quantity). Schildvortriebe in feinkörnigen, tonhaltigen Böden sind häufig mit Verklebungen verbunden. Die Verklebungsneigung von Lockergesteinen hängt von einer Vielzahl an Parametern ab. Auch das Auflösen von Feinkorn aus dem kohäsiven Bodengefüge führt vielfach zu negativen Auswirkungen. Ob ein bestimmtes tonhaltiges Lockergestein kritisch werden kann, hängt neben den Bodeneigenschaften auch von den hydrogeologischen und baubetrieblichen Randbedingungen ab. Je nach Angebot an freiem Wasser (Bergwasser, Stützflüssigkeit) können die Böden in kritische Konsistenzbereiche überführt werden. Mit einem Bewertungs-Diagramm, das mögliche Wassergehaltsänderungen während des Vortriebs berücksichtigt, können Böden auch unter wechselnden Randbedingungen (unterschiedliches Wasserangebot) beurteilt werden.
Source:	Geomechanics and Tunnelling 5 (2012), No. 5
Page/s:	574-580
Language of Publication:	English/German

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