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首页> 外文期刊>Journal of Materials Research and Technology >Experimental study on the dynamic mechanical properties of high-performance hybrid fiber-reinforced concrete of mine shaft lining
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Experimental study on the dynamic mechanical properties of high-performance hybrid fiber-reinforced concrete of mine shaft lining

机译：矿井轴线高性能杂交纤维混凝土动态力学性能的试验研究

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Deep mine shafts are susceptible to rupture under dynamic loading. To solve this problem, hybrid fiber-reinforced concrete (HFRC) is proposed as a construction material for mine shaft lining. Herein, its dynamic mechanical properties are experimentally studied. With high-strength shaft lining concrete as the reference, HFRC specimens are prepared by mixing polyvinyl alcohol fibers and imitation steel fibers at different volumetric ratios. Falling-weight impact tests demonstrate that the first-crack and failure impact energies of the HFRC are 2.4 and 20.0 times to the reference concrete, respectively. In addition, the HFRC provided better cracking resistance and higher toughness. Split Hopkinson pressure bar tests demonstrate that compared with the reference concrete, the peak stress and peak strain of the HFRC under a 0.7 MPa impact air pressure are increased by 46.19% and 34.11%, respectively. The toughness index is increased by 50.51% within the strain range from 0 to 0.008. These results indicate that compared with the reference concrete, the HFRC has significantly higher dynamic strength and compressive deformation capacity with well-improved brittleness;further, it can effectively resist impact loading under variable strain rates, thereby making it an ideal supporting material for mine shaft lining under dynamic loading.
机译：深矿井轴易受动态载荷破裂的影响。为了解决这个问题，提出了混合纤维钢筋混凝土（HFRC）作为矿井轴衬里的建筑材料。这里，实验研究其动态机械性能。通过作为参考的高强度轴线混凝土，通过以不同的体积比混合聚乙烯醇纤维和仿钢纤维来制备HFRC样品。下降重量的冲击试验表明，HFRC的第一裂纹和失效冲击能量分别为参考混凝土的2.4％和20.0倍。此外，HFRC提供了更好的抗裂性和更高的韧性。分裂霍普金森压力棒试验表明，与参考混凝土相比，HFRC下的峰值应力和峰值应变在0.7MPa冲击气压下分别增加了46.19％和34.11％。韧性指数在应变范围内增加50.51％，从0到0.008。这些结果表明，与参考混凝土相比，HFRC具有显着更高的动态强度和压缩变形容量，具有良好的脆性;此外，它可以有效地抵抗可变应变速率下的冲击载荷，从而使其成为矿井轴的理想支撑材料在动态载荷下衬里。

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