| Cite this article as: |
Jiajian Li, Shuai Cao, Erol Yilmaz, and Yunpeng Liu, Compressive fatigue behavior and failure evolution of additive fiber-reinforced cemented tailings composites, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 345-355. https://doi.org/10.1007/s12613-021-2351-x
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曹帅 E-mail: sandy_cao@ustb.edu.cn
Erol Yilmaz E-mail: erol.yilmaz@erdogan.edu.tr
尾砂胶结充填体（Cemented tailings backfill，以下简称CTB）是由尾矿、胶凝材料和水制备的水泥基复合材料。类似于混凝土，充填体在外载荷作用下其表现出明显的脆性，易发生垮塌、连锁破坏等现象。本文提出采用聚丙烯纤维和玻璃纤维的组合形式，探究上述纤维对充填体单轴抗压强度的影响机制。在本文中，作者们进行了一系列的实验室测试，包括单轴压缩试验、数字图像相关测量和纤维增强充填体（Fiber reinforced cemented tailings backfill，以下简称FRCTB）的扫描电子显微镜特征，以获得FRCTB试样的单轴抗压强度（UCS）、破坏演变和微观结构特征。结果表明，添加纤维可以使CTB的UCS值提高6.90%至32.76%。FRCTB的UCS值随着聚丙烯纤维含量的增加而增加。此外，PP纤维对CTB的增强效果优于玻璃纤维的增强效果。纤维的加入可以使FRCTB的峰值应变增加0.39%到1.45%。FRCTB的峰值应变随着玻璃纤维含量的增加而增加。FRCTB的破坏模式是拉伸和剪切破坏相结合的。纤维的加入有效地抑制了裂缝的扩展，纤维对裂缝的桥接作用有效地改善了FRCTB的力学性能。本研究的结果可以为矿山回填设计和优化回填方法提供依据。
The ordinary cemented tailings backfill (CTB) is a cement-based composite prepared from tailings, cementitious materials, and water. In this study, a series of laboratory tests, including uniaxial compression, digital image correlation measurement, and scanning electron microscope characteristics of fiber-reinforced CTB (FRCTB), was conducted to obtain the uniaxial compressive strength (UCS), failure evolution, and microstructural characteristics of FRCTB specimens. The results show that adding fibers could increase the UCS values of the CTB by 6.90% to 32.76%. The UCS value of the FRCTB increased with the increase in the polypropylene (PP) fiber content. Moreover, the reinforcement effect of PP fiber on the CTB was better than that of glass fiber. The addition of fiber could increase the peak strain of the FRCTB by 0.39% to 1.45%. The peak strain of the FRCTB increased with the increase in glass fiber content. The failure pattern of the FRCTB was coupled with tensile and shear failure. The addition of fiber effectively inhibited the propagation of cracks, and the bridging effect of cracks by the fiber effectively improved the mechanical properties of the FRCTB. The findings in this study can provide a basis for the backfilling design and optimization of mine backfilling methods.
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