Study on the Mechanical and Flow Properties of Polypropylene Fiber Reinforced Cemented Tailings Backfill
HOU Yongqiang1,2, YIN Shenghua1,2, ZHAO Guoliang3,4, ZHANG Pengqiang3,4, YANG Shixing1,2, ZHANG Minzhe1,2, LIU Hongbin1,2
1 School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China 3 National Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd., Jinchang, 737100, China 4 Jinchuan Nickel Cobalt Research and Design Institute, Jinchang 737100, China
Abstract: Aiming at the influence of polypropylene fiber content, length and slag content on the mechanical and flow properties of polypropylene fiber reinforced cemented tailings backfill, an orthogonal experimental design was carried out. Through the range and variance analysis of the test results, the degree of influence and significant influence factors of the three factors are obtained, and the mechanism of the influence of fibers on the mechanical properties of the cemented tailings backfill is revealed with the help of scanning electron microscope (SEM). The research results show that: the slump of filler slurry decreased by 8.7% and 4.3% with the increase of fiber content and length indicating that the incorporation of fibers can have an adverse effect on the fluidity of the slurry; the compressive strength and tensile strength of the cemented tailings backfill at 28 d both increase first and then decrease with the increase of the fiber content and reach the maximum when the fiber content is 0.6%, but the improvement effect of the tensile strength of the polypropylene fiber by the fiber is obviously better than compressive strength; the incorporation of slag has no significant effect on the fluidity of the cemented tailings backfill, but the increase in slag content reduces the compressive and tensile strength of the backfill by 17.9% and 19.7%, which shows that the incorporation of slag will adversely affect the mechanical properties of the fiber reinforced cemented tailings backfill; the incorporation of fibers can effectively limit the propagation of cracks in the cemented tailings backfill and the failure characteristics of the cemented tailings backfill change from brittleness to ductility with the increase of fiber content; the key to the mechanical properties of the fiber-reinforced backfill is that there is a bonding force between the fiber and the mortar matrix, so that the fibers across the cracks can form an “anchor” effect thereby improving the overall mechanical properties of the backfill.
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2021, Vol. 35 
