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Volume 31 Issue 11
Nov.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(11): 2390-2403
Xihao Li, Shuai Cao, and Erol Yilmaz, Microstructural evolution and strengthening mechanism of aligned steel fiber cement-based tail backfills exposed to electromagnetic induction, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2390-2403. https://doi.org/10.1007/s12613-024-2985-6
Cite this article as:
Xihao Li, Shuai Cao, and Erol Yilmaz, Microstructural evolution and strengthening mechanism of aligned steel fiber cement-based tail backfills exposed to electromagnetic induction, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2390-2403. https://doi.org/10.1007/s12613-024-2985-6
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研究论文

电磁感应作用下定向钢纤维尾砂胶结充填体的微观结构演变和强化机制

  • 1)

    北京科技大学土木与资源工程学院, 北京 100083, 中国

  • 2)

    北京科技大学金属矿山高效开采与安全教育部国家重点实验室, 北京 100083, 中国

  • 3)

    Department of Civil Engineering, Geotechnical Division, Recep Tayyip Erdogan University, Fener Rize TR53100, Turkey


  • 通讯作者:

    曹帅    E-mail: sandy_cao@ustb.edu.cn

    Erol Yilmaz    E-mail: erol.yilmaz@erdogan.edu.tr

文章亮点

  • (1) 在单轴抗压试验中考虑了钢纤维尾砂胶结充填体的电磁感应强度效应
  • (2) 纤维的定向分布对提高钢纤维尾砂胶结充填体的抗压强度有显著影响
  • (3) 钢纤维的存在及其定向分布能很好地抑制裂纹的发展
  • 尾砂胶结充填不仅能提高采矿安全性，减少地表环境污染，而且能回收作为矿柱保留的矿石，从而提高资源利用率。在尾砂胶结充填体中掺入钢纤维等添加物，可以提高其强度，尤其是相邻两个矿房开采时，可以提高采场结构的稳定性。本文考虑钢纤维掺量和电磁感应强度效应，对钢纤维尾砂胶结充填体进行了微观结构和强度测试。实验结果表明：钢纤维掺量及其分布方向对提高填料强度有重要影响。当磁感应强度为 3×10−4 T时，纤维体积比为 2.0%时，单轴抗压强度达到 5.73 MPa。试件裂纹的扩展主要从试件的上部开始，并随着载荷的增加逐渐向下扩展，直至发生破坏，钢纤维的掺入及其定向分布延缓了裂纹的发展。当钢纤维体积比为 2.0%时，钢纤维尾砂胶结充填体表现出优异的延性特性。除此之外，当钢纤维掺量和磁感应强度增加时，充填体达到破坏所需的能量也会增加。本研究所得结论为钢纤维作为充填添加物以提高尾砂胶结充填体强度提供了理论参考。
    • Research Article

    Microstructural evolution and strengthening mechanism of aligned steel fiber cement-based tail backfills exposed to electromagnetic induction

    + Author Affiliations
      Abstract
    • Cemented tailings backfill (CTB) not only boosts mining safety and cuts surface environmental pollution but also recovers ores previously retained as pillars, thereby improving resource utilization. The use of alternative reinforcing products, such as steel fiber (SF), has continuously strengthened CTB into SFCTB. This approach prevents strength decreases over time and reinforces its long-term durability, especially when mining ore in adjacent underground stopes. In this study, various microstructure and strength tests were performed on SFCTB, considering steel fiber ratio and electromagnetic induction strength effects. Lab findings show that combining steel fibers and their distribution dominantly influences the improvement of the fill’s strength. Fill’s strength rises by fiber insertion and has an evident correlation with fiber insertion and magnetic induction strength. When magnetic induction strength is 3 × 10−4 T, peak uniaxial compressive stress reaches 5.73 MPa for a fiber ratio of 2.0vol%. The cracks’ expansion mainly started from the specimen’s upper part, which steadily expanded downward by increasing the load until damage occurred. The doping of steel fiber and its directional distribution delayed crack development. When the doping of steel fiber was 2.0vol%, SFCTBs showed excellent ductility characteristics. The energy required for fills to reach destruction increases when steel-fiber insertion and magnetic induction strength increase. This study provides notional references for steel fibers as underground filling additives to enhance the fill’s durability in the course of mining operations.
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