玄武岩纤维增强尾矿力学性能的试验研究

为提高尾矿坝的安全稳定性,提出纤维加筋增强尾矿力学性质的方法,采用三轴试验和扫描电镜(SEM)技术观测法,系统研究纤维加筋效果和纤维作用机制。首先,以云锡公司某选厂分级尾矿作为试验试样,甄选出玄武岩纤维作为加筋尾矿的理想材料,制备纤维加筋尾矿试样;然后,开展纤维加筋尾矿试样的三轴剪切试验,研究尾矿干密度纤维参数等对玄武岩纤维加筋尾矿力学性能的影响;最后,借助SEM,从微细观的角度分析玄武岩纤维与尾矿颗粒的界面作用特性,揭示纤维增强尾矿力学性能的作用机制。结果表明:玄武岩纤维能有效提高尾矿的抗剪强度;随干密度和围压的增大,加筋尾矿的抗剪强度增大;尾矿颗粒越粗糙,纤维作用效果越好。

Experimental study on mechanical properties of basalt fiber-reinforced tailings

In order to improve the stability of tailings dam, a method for enhancing the mechanical properties of tailings by fiber reinforcement was worked out. Triaxial experiments and scanning electron microscope ( SEM) tests were carried out to systematically study fiber reinforcement effect and fiber action mechanism. Firstly, a classified tailings material from Yunxi company as taken the test sample, basalt fiber was taken as an ideal reinforcement material for the tailings, and basalt fiber was added to tailings slurry, and then a fiber reinforced tailings specimen was formed after tailings natural deposition. Then, a triaxial test of the specimen was carried out to study the effects of dry density on the mechanical properties of the specimen. Finally, the interfacial interaction between basalt fiber and tailings particles were analyzed by SEM from a microscopic point of view. The results show that the basalt fiber can enhance mechanical property of tailings, that the shear strength of reinforced tailings increases with the increase of both dry density and confining pressure, and that the coarser the tailings particles are, the better the reinforcing effect.