Direct measurement of matric suction in triaxial tests on early-age cemented paste backfill
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.
|Keywords||Cemented paste backfill, Cemented soil, Matric suction, Triaxial testing, Unsaturated soil|
|Journal||Canadian Geotechnical Journal|
Simms, P, & Grabinsky, M. (Murray). (2009). Direct measurement of matric suction in triaxial tests on early-age cemented paste backfill. Canadian Geotechnical Journal, 46(1), 93–101. doi:10.1139/T08-098