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An investigation of the Uniaxial Compressive Strength of a cemented hydraulic backfill made of alluvial sand

Guangsheng Liu, Li Li, Mike Yao, David Landry, Farid Malek, Xiaocong Yang and Lijie Guo

Article (2017)

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Cite this document: Liu, G., Li, L., Yao, M., Landry, D., Malek, F., Yang, X. & Guo, L. (2017). An investigation of the Uniaxial Compressive Strength of a cemented hydraulic backfill made of alluvial sand. Minerals, 7(1), p. 1-13. doi:10.3390/min7010004
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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.

Uncontrolled Keywords

cemented hydraulic backfill; uniaxial compressive strength; failure mode; segregation

Open Access document in PolyPublie
Subjects: 1400 Génie minier et minéral > 1401 Génie minier
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: China Scholarship Council (CSC), CRSNG, Institut de recherche Robert-Sauvé en Santé et en Sécurité du Travail, Fonds de recherche du Québec--Nature et technologies (FRQNT), National Science and Technology Support Program of China, Scientific Research Fund of Beijing General Research Institute of Mining and Metallurgy of China, National Key Research and Development Plan of China
Grant number: 201406460041, 402318, IRSST 2019-0029, 2015-MI-191676, 2013BAB02B02, YJ201507, 2016YFC0600709
Date Deposited: 14 Dec 2018 16:03
Last Modified: 08 Apr 2021 10:43
PolyPublie URL: https://publications.polymtl.ca/3534/
Document issued by the official publisher
Journal Title: Minerals (vol. 7, no. 1)
Publisher: MDPI
Official URL: https://doi.org/10.3390/min7010004


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