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Minerals 2017, 7(1), 4; https://doi.org/10.3390/min7010004

An Investigation of the Uniaxial Compressive Strength of a Cemented Hydraulic Backfill Made of Alluvial Sand

1
School of Civil and Resources Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
2
Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, C.P. 6079 Succursale Centre-Ville, Montreal, QC H3C 3A7, Canada
3
Beijing General Research Institute of Mining and Metallurgy, Building 23, Zone 18 of ABP, No. 188, South 4th Ring Road West, Beijing 100160, China
4
Mining TEC (Technical Excellence Centre), Vale Base Metals, Brownfield Exploration, 337 Power Street, Copper Cliff, Sudbury, ON P0M 1N0, Canada
5
Mines Geology & Technical Services, Vale Canada Limited, Ontario Operations, Vale Canada Limited, 18 Rink Street, Copper Cliff, Sudbury, ON P0M 1N0, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Tuncel M. Yegulalp
Received: 10 August 2016 / Revised: 15 December 2016 / Accepted: 21 December 2016 / Published: 3 January 2017
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Abstract

Backfill is commonly used in underground mines. The quality control of the backfill is a key step to ensure it meets the designed strength requirement. This is done through sample collection from the underground environment, followed by uniaxial compression tests to obtain the Uniaxial Compressive Strength (UCS) in the laboratory. When the cylindrical cemented backfill samples are axially loaded to failure, several failure modes can be observed and mainly classified into diagonal shear failure and axial split failure. To date, the UCS obtained by these two failure modes are considered to be the same with no distinction between them. In this paper, an analysis of the UCS results obtained on a cemented hydraulic backfill made of alluvial sand at a Canadian underground mine over the course of more than three years is presented. The results show that the UCS values obtained by diagonal shear failure are generally higher than those obtained by axial split failure for samples with the same recipe and curing time. This highlights the importance of making a distinction between the UCS values obtained by the two different modes of failure. Their difference in failure mechanism is explained. Further investigations on the sources of the data dispersion tend to indicate that the UCS obtained by laboratory tests following the current practice may not be representative of the in-situ strength distribution in the underground stopes due to segregation in cemented hydraulic backfill. View Full-Text
Keywords: cemented hydraulic backfill; uniaxial compressive strength; failure mode; segregation cemented hydraulic backfill; uniaxial compressive strength; failure mode; segregation
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Liu, G.; Li, L.; Yao, M.; Landry, D.; Malek, F.; Yang, X.; Guo, L. An Investigation of the Uniaxial Compressive Strength of a Cemented Hydraulic Backfill Made of Alluvial Sand. Minerals 2017, 7, 4.

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