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Mechanical Properties of Clay Based Cemented Paste Backfill for Coal Recovery from Deep Mines

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  • Qiangqiang Cheng

    (School of Architectural Construction, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China
    School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Yaben Guo

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Chaowei Dong

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Jianfei Xu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Wanan Lai

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Bin Du

    (School of Architectural Construction, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China)

Abstract

Fly ash cement is used to solidify marine clay to prepare marine-clay-based cemented paste backfill (MCCPB) to fill the underground goaf of mines, which not only utilizes solid waste such as fly ash and marine clay, but also controls surface subsidence and protects the environment. To simulate the complex underground mine water environment of the filling body, a dry-wet cycle aquatic environment test under different material ratios and curing ages was designed. The water absorption and unconfined compression strength (UCS) of MCCPB with curing ages of 7 and 28 days under the action of 0, 1, 3, and 7 dry-wet cycles were investigated. The results indicate as the number of dry-wet cycles increases, the surface of MCCPB becomes significantly rougher, and the water content and the solid mass decrease accordingly. Different ratios and curing ages of MCCPB in dry-wet cycles of the UCS tend first to increase, then decrease. Meanwhile, the stress-strain curve of the specimen shows that the trend in the elastic modulus is consistent with that of UCS (first increasing, then decreasing), and that, the minimum UCS value of the specimen still meets the early strength requirements of cemented paste backfill in coal mine geothermal utilization. On the one hand, it proves the feasibility of fly ash cement-solidified marine clay for use as cemented paste backfill in coal mines; on the other hand, it also expands the available range of cemented paste backfill materials in coal mines.

Suggested Citation

  • Qiangqiang Cheng & Yaben Guo & Chaowei Dong & Jianfei Xu & Wanan Lai & Bin Du, 2021. "Mechanical Properties of Clay Based Cemented Paste Backfill for Coal Recovery from Deep Mines," Energies, MDPI, vol. 14(18), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5764-:d:634498
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    References listed on IDEAS

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    1. Xiaoyan Zhang & Yuhang Jia & Mei Wang & Lang Liu, 2019. "Experimental Research on Heat Transfer and Strength Analysis of Backfill with Ice Grains in Deep Mines," Sustainability, MDPI, vol. 11(9), pages 1-14, April.
    2. Xinguo Zhang & Jia Lin & Jinxiao Liu & Fei Li & Zhenzhong Pang, 2017. "Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine," Energies, MDPI, vol. 10(9), pages 1-19, September.
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    Cited by:

    1. Stanisław Stryczek & Andrzej Gonet & Marcin Kremieniewski, 2022. "Special Cement Slurries for Strengthening Salt Rock Mass," Energies, MDPI, vol. 15(16), pages 1-10, August.

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