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    Volume 43, Issue 2 (March 2020)

    A Narrow Wall System to Capture Temperature Stress–Strain Behavior in Paste Backfill

    (Received 25 October 2017; accepted 22 January 2019)

    Published Online: 29 March 2019

    CODEN: GTJODJ

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    Abstract

    Placing mine tailings back into underground mined-out stopes is becoming increasingly used internationally because it improves ore recovery, reduces dilution of valuable ore, and increases environmental benefits due to the reduced size of the storage facilities of surface tailings. In recent years, a number of stopes backfilled with cemented paste backfill have been instrumented with load cells and piezometers to improve our understanding of in situ behavior. Many of these studies have reported results that show increases in measured total stresses when there is no increase in applied load, i.e., even when the backfilling process has been long completed. One explanation is that these stress increases result from expansive volume changes of the backfill as it hydrates and generates heat. This article proposes and describes a novel laboratory apparatus called a narrow wall system to investigate this hypothesis, focusing on modeling narrow stopes as these are relatively common in backfill applications. Results from the experiments agree qualitatively with the reported field observations, showing clear increases in measured pressure during periods of temperature increase. The article concludes that the proposed narrow wall system works effectively and has been able to capture the temperature stress–strain behavior of paste backfill. Thus, the temperature effect hypothesis has now been supported by evidence. Using the system, further studies related to geometrical or scale effects are suggested. The results are important for academics and engineers to improve backfill design in mining operations.

    Author Information:

    Ting, Wee Kiet
    Department of Civil Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak

    Hasan, Alsidqi
    Department of Civil Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak

    Sahdi, Fauzan
    Department of Civil Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak

    Centre for Offshore Foundation Systems, The University of Western Australia, Perth, Western Australia

    Linda Taib, Siti Noor
    Department of Civil Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak

    Sutan, Norsuzailina Mohamed
    Department of Civil Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak

    Aziz, Badhrulhisham Abdul
    Department of Chemical and Natural Resources Engineering, Rare Earth Research Center, Universiti Malaysia Pahang, Pekan,

    Fourie, Andy
    School of Civil, Environmental, and Mining Engineering, The University of Western Australia, Perth, Western Australia


    Stock #: GTJ20170383

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170383

    Author
    Title A Narrow Wall System to Capture Temperature Stress–Strain Behavior in Paste Backfill
    Symposium ,
    Committee D18