Journal
CANADIAN GEOTECHNICAL JOURNAL
Volume 46, Issue 1, Pages 93-101Publisher
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
DOI: 10.1139/T08-098
Keywords
cemented paste backfill; matric suction; unsaturated soil; cemented soil; triaxial testing
Funding
- Natural Sciences and Engineering Research Council (NSERC)
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Hydration occurring in cemented paste backfill (CPB) is shown to generate matric suction through self-desiccation. This complicates determination of the water-retention curve and mechanical properties during curing, which are important in stope design, and renders problematic the use of axis-translation testing procedure to control suctions in strength testing. An alternative is to monitor suction directly during testing. To this end, a miniature tensiometer is inserted into the base of a triaxial cell. A series of unconfined and confined tests are performed on early-age (less than two weeks old) CPB. The observed behaviour is similar to that observed in weakly cemented soils, showing a distinct tendency to dilate during shearing.
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