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Shot-clay MX-80 bentonite: An assessment of the hydro-mechanical behaviour

Engineering Geology, ISSN: 0013-7952, Vol: 173, Page: 10-18
2014
  • 20
    Citations
  • 0
    Usage
  • 47
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    20
    • Citation Indexes
      20
  • Captures
    47

Article Description

This study presents the results of an experimental study conducted to characterise the hydro-mechanical behaviour of shot-clay MX-80 bentonite. In the shot-clay process, granular bentonite was mixed continuously with water and shot on the walls of a tunnel section at the Grimsel Underground Research Laboratory (URL), in Switzerland. The shot-clay was placed to create a layer of bentonite in direct contact with the host rock to avoid preferential water and/or gas flow along the tunnel wall. Samples for an experimental programme were collected during the shooting. The index properties, microstructural features, swelling potential and water retention properties of the shot-clay were analysed. An experiment was then conducted under controlled total suction to analyse the hydro-mechanical behaviour of the material along a predefined stress path involving suction and confining stress variations. Based on the results of this test, the expected behaviour of the shot-clay bentonite when subjected to the environmental conditions in the repository was determined. The test results were compared with data on the observed behaviour of compacted MX-80 granular bentonite to assess the effects of the shot-clay emplacement technique on the behaviour of the MX-80 bentonite. The results highlight the role of the emplacement dry density on the behaviour of bentonite.

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