Reliability of using laboratory-determined soil water characteristic data for mine waste cover design

Williams, D. J. and Rohde, T. K. (2009). Reliability of using laboratory-determined soil water characteristic data for mine waste cover design. In: Andy Fourie and Mark Tibbett, Mine Closure 2009: Proceedings of the Fourth International Conference on Mine Closure. Mine Closure 2009, Perth, Australia, (493-504). 9 - 11 September 2009.


Author Williams, D. J.
Rohde, T. K.
Title of paper Reliability of using laboratory-determined soil water characteristic data for mine waste cover design
Conference name Mine Closure 2009
Conference location Perth, Australia
Conference dates 9 - 11 September 2009
Proceedings title Mine Closure 2009: Proceedings of the Fourth International Conference on Mine Closure
Place of Publication Perth, Australia
Publisher Australian Centre for Geomechanics
Publication Year 2009
Year available 2009
Sub-type Fully published paper
ISBN 978-0-9804158-9-0
Editor Andy Fourie
Mark Tibbett
Start page 493
End page 504
Total pages 12
Collection year 2010
Language eng
Abstract/Summary Soil water characteristic curves (SWCCs) used for the design of covers over mine wastes, are typically determined in the laboratory by performing drying tests on samples in a Tempe cell. In some cases, re-wetting is also carried out. The advantage of using drying tests is that they are carried out from the saturated state at a given sample test density; so that there is some chance of obtaining repeatable results. However, re-wetting is carried out from the arbitrary end-point of a drying test, giving a different re-wetting curve from each of these points. SWCC data may also be measured directly in the laboratory and in the field. Depending on the uniformity, stress history, structure and any cementation of soils under laboratory or field conditions, their SWCC data may be very different from the SWCC data collected after sample preparation and saturation for laboratory Tempe cell drying testing. The paper presents in situ, laboratory and field SSWC data for mine waste covers that highlight the strong influence that structure, cementation, sampling disturbance, sample preparation, saturation, uniformity, construction control and stress history can have on the data. They cast some doubt on the design of mine waste covers based solely on the use of laboratory-determined SWCCs.
Subjects E1
090501 Civil Geotechnical Engineering
849804 Management of Solid Waste from Mineral Resource Activities
Q-Index Code E1
Q-Index Status Confirmed Code

 
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Created: Tue, 27 Apr 2010, 15:10:37 EST by Jeannette Watson on behalf of School of Civil Engineering