纤维含量⁃浓度效应下尾砂胶结材料受压性能响应

Response of compressive properties of cemented tailings material under the coupling effect of fiber content and concentration

为推动纤维增强尾砂胶结材料(FRCM)在工程中的应用,研究分析了混合纤维(玻璃纤维与聚丙烯腈纤维的混合物)含量与浓度耦合效应下FRCM的力学性能变化规律。通过单轴压缩试验得到纤维质量含量为0%,0.5%,0.7%和料浆浓度为65%,68%,72%的FRCM抗压强度和弹性模量,并提出以极限应变因子K来评价FRCM的抗压韧性。研究结果表明:浓度是影响FRCM强度的关键,浓度为65%时,FRCM抗压强度随纤维含量增加而增加的增长率最大,并在一定纤维含量条件下有良好的提升空间;纤维含量是影响FRCM抗压韧性的关键,浓度为68%时,FRCM的K值增幅较大,体现出良好的抗压韧性性能;当浓度为65%时,FRCM的弹性模量随纤维含量增加而增加的增长率相对稳定。

To promote the application of fiber reinforced cemented tailings material(FRCM)in engineering field,variation law of the mechanical properties of FRCM under the coupling effect of fibers(a mixture of glass fiber and polyacrylonitrile fiber)content and concentration were investigatd.The compressive strength and elastic modulus of FRCM were obtained by uniaxial compression test under varied fiber content of 0%,0.5%and 0.7%and varied concentration of 65%,68%and 72%,and the ultimate strain factor K was proposed to evaluate the compressive toughness of FRCM.The results showed that concentration was the key to influence the strength of FRCM.With the increase of fiber content,the compressive strength of FRCM increased,and the increase rate reached its maximum value when the concentration reached 65%.It had further improvement space under certain fiber contents,too.The fiber content of FRCM had a significant impact on its compressive toughness,the K value of FRCM increased significantly when the concentration was 68%and it showed favorable compressive toughness.FRCM's elastic modulus increased with fiber content,but the increase tended to stay relatively stable as the concentration reached 65%.