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Clay Minerals; September 2001; v. 36; no. 3; p. 435-446
© 2001 Mineralogical Society of Great Britain and Ireland
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Research Paper

Modelling water uptake in highly compacted bentonite in environmental sealing barriers

J. GATTERMANN1, W. WITTKE2 and C. ERICHSEN2

1 Ed. Züblin AG, D-70567 Stuttgart, and 2 WBI, Consulting Engineers for Foundation Engineering and Construction in Rock Ltd., D-52072 Aachen, Germany

* E-mail: wbi{at}wbionline.de

(Received 5 June 2000; revised 19 December 2000)

Plans to close a German radioactive waste repository in rock salt include as one alternative the construction of a ‘Cross Section Closure (CSC)’ sealing barrier. The proposed material for the sealing barrier is highly compacted bentonite. To investigate the swelling behaviour of a highly compacted bentonite, a large number of laboratory tests were performed. In addition, large scale model tests were carried out to demonstrate the development of a nearly homogeneous and isotropic swelling pressure. The results of the large scale model tests were interpreted numerically based on the models for stress-strain behaviour and water uptake which are implemented in the finite element computer codes FEST03 and HYDOPO. The investigations show good agreement between the results of the model tests and the corresponding analyses and show that the theoretical models are capable of describing the behaviour of sealing structures based on highly compacted bentonite.

KEYWORDS: bentonite, environmental sealing barrier, large-scale model test, swelling pressure, underground repository, water uptake






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