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Author(s):	Anagnostou, G.; Pimentel, E.; Serafeimidis, K.
Title:
Abstract:	Sulphatic claystones exhibit a heavily swelling behaviour and are among the most problematic rocks for tunnelling. Their swelling is usually attributed to the transformation of anhydrite to gypsum. The paper questions this simplistic hypothesis through a qualitative discussion of the processes underlying the phenomena that are observed macroscopically, and by identifying a series of fundamental issues that are important from the point of view of tunnel design. At the same time, it provides an overview of ongoing or recent research dealing with the swelling of sulphatic claystones and, more specifically, with the effects of chemical reactions and transport processes, the role of the clay fraction, the pressure dependence of swelling deformations and the possible effects of the seepage flow regime, including evaporation in the unsaturated zone. Sulfathaltige Tonsteine weisen ein besonders starkes Quellverhalten auf und gehören zu den problematischsten Gesteinen beim Tunnelbau. Ihr Quellen wird üblicherweise auf die Umwandlung von Anhydrit zu Gips zurückgeführt. Der vorliegende Aufsatz diskutiert diese vereinfachende Hypothese, indem er die dem makroskopisch beobachtbaren Quellvorgang zugrundeliegenden Prozesse qualitativ behandelt und eine Übersicht über aktuelle Forschungsprojekte vermittelt. Dabei wird eine Reihe von Themen der Grundlagenforschung identifiziert, die auch von praktischer Bedeutung sind. Zu diesen gehören die Fragen nach dem Einfluss der chemischen Reaktions- und Transportvorgänge, der Rolle der Tonfraktion, der Druckabhängigkeit der Quellverformungen und der Bedeutung der Sickerströmung.
Source:	Geomechanics and Tunnelling 3 (2010), No. 5
Page/s:	567-572
Language of Publication:	English/German

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