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High-density bimodal bentonite blends for hydraulic sealings at the Ibbenbüren coalmine

Published online by Cambridge University Press:  02 January 2018

Felicitas Wolters
Affiliation:
Clostermann Consulting GmbH & Co KG, Generationenweg 4, D-44225 Dortmund, Germany
Wiebke Baille
Affiliation:
Ruhr-Universität Bochum, Lehrstuhl für Grundbau, Boden- und Felsmechanik, Universitätsstrasse 150, Geb. IC/E5/ 109, D-44780 Bochum, Germany
Katja Emmerich
Affiliation:
Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, Geb.330 Raum 155, D-76344 Eggenstein- Leopoldshafen, Germany
Eva Schmidt
Affiliation:
Stephan Schmidt KG, Bahnhofstrasse 92, D-65599 Dornburg, Germany
Christian Wolters
Affiliation:
Clostermann Consulting GmbH & Co KG, Generationenweg 4, D-44225 Dortmund, Germany
Franz Königer
Affiliation:
Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, Geb.330 Raum 155, D-76344 Eggenstein- Leopoldshafen, Germany
Jürgen Kunz
Affiliation:
RAG Antrazith GmbH Ibbenbüren, Osnabrücker Strasse 112, D-49477 Ibbenbüren, Germany
Volker Krase
Affiliation:
Zerna Planen und Prüfen, Lise-Meitner-Allee 11, D-44801 Bochum, Germany
Matthias Schellhorn
Affiliation:
Stephan Schmidt KG, Bahnhofstrasse 92, D-65599 Dornburg, Germany
Corresponding
E-mail address:
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Abstract

The two high-pressure water-retaining dams at the Ibbenbüren coalmine in Münsterland (Germany) have to perform reliably under the induced tension caused by further exploitation of the current mining area. The load-bearing and the sealing functions of the new barriers were separated and new sealing materials were developed. An innovative multilayer sealing system of bentonite and sandwiched equipotential layers (SANDWICH) supporting homogeneous swelling and sealing, independent of formation water (Nüesch et al., 2002), was applied in this project. A testing program of strain-controlled swelling pressure tests on compacted bentonite specimens and on a bentonite/sand mixture was conducted to ensure an adequate potential for swelling-pressure development.

The measurements under constant volume for dry densities between 1.45 g/cm3 and 1.67 g/cm3 showed an evolving swelling pressure between 1.04 and 1.8 MPa for 100% bentonite samples. Straincontrolled oedometer tests for zero strain and step-wise applied strain up to 2% revealed that a sufficient magnitude of swelling pressure existed at maximum applied strain.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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