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Author(s):	Weiner, Thorsten; Thewes, Markus
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Abstract:	In this contribution, we present a new testing method for the prediction of the dispersion of soil in slurry shield tunnelling. It is based on the proven slake durability test equipment but differs substantially regarding the procedure for testing and evaluation. With the results, a substantial data analysis was conducted searching for correlations with typical characteristic soil parameters. For the first time in tunnelling practice, the test enables a qualitative assessment and therefore a prognosis of the expected dispersion based on quantitative values determined in a traceable and reproducible testing method. In addition the test allows for an estimation of the dispersion tendency based on figures for the plasticity and consistency, which are usually collected anyway in the preliminary stages of a tunnelling project. Contractual recommendations are also provided concerning the topic of dispersion. In diesem Beitrag wird eine neue Methode zur Prognose der Dispergierung beim flüssigkeitsgestützten Schildvortrieb vorgestellt. Durch verschiedene uni- und multivariate Analysen konnte ein Zusammenhang zwischen der Dispergierung und den charakteristischen Kennwerten für die Plastizität und die Konsistenz eruiert werden. Letztendlich besteht nun zum einen die Möglichkeit, den Dispergierungsversuch direkt zur Feststellung der Dispergierungsneigung des anstehenden Baugrunds anzuwenden. Zum anderen kann zur qualitativen Prognose der Dispergierung auf ein Diagramm zurückgegriffen werden, wenn die für bindige Böden üblichen Kennwerte der Plastizitätszahl IP und der Konsistenzzahl IC ermittelt worden sind. Außerdem wird eine Handlungsempfehlung zum vertraglichen Umgang mit der Thematik skizziert.
Source:	Geomechanics and Tunnelling 11 (2018), No. 5
Page/s:	471-478
Language of Publication:	English/German

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