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Microstructural stability controls the hydraulic conductivity of smectitic buffer clay

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Author

Summary, in English

The hydraulic conductivity of smectitic buffer clays is determined by the volume fraction and continuity of permeable parts of the microstructure, i.e., soft and medium-dense clay gels. The bulk conductivity calculated by use of microstructural parameters agrees well with experimental data except for soft Ca bentonite, which is significantly less permeable than predicted. The microstructural stability of its softest parts is poor, which causes erosion, transport and accumulation of particles yielding clogging of voids and reduction in conductivity. The presence of soft parts explains why water under relatively high pressure can penetrate to a few centimeters depth in partly water-saturated clay and why gas makes its way through channel-like paths in saturated clay. (C) 2003 Elsevier Science B.V. All rights reserved.

Publishing year

2003

Language

English

Pages

35-41

Publication/Series

Applied Clay Science

Volume

23

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Engineering

Keywords

  • numerical calculation
  • erosion
  • bentonite
  • clay
  • microstructure
  • flow

Status

Published

ISBN/ISSN/Other

  • ISSN: 1872-9053