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Compressive fatigue behavior and failure evolution of additive fiber-reinforced cemented tailings composites

查看全文 作　　者：Jiajian [1,2]Li;Shuai [1,2]Cao;Erol [3]Yilmaz;Yunpeng [4]Liu 高影响力作者 机构地区：[1]School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;[2]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China;[3]Department of Civil Engineering,Geotechnical Division,Recep Tayyip Erdogan University,Fener,Rize TR53100,Turkey;[4]State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology),Wuhan 430070,China高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2022年第29卷第2期,共11页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China(No.51804017);the Fundamental Research Funds for Central Universities,China(No.FRF-TP-20-001A2);the State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology)(No.SYSJJ2021-04)。 摘　　要：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 by0.39%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. 关 键 词：cemented tailings backfill uniaxial compressive strength combined fiber reinforcement digital image correlation microstructural characteristics
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