超细粒尾矿—炉渣混合体漫坝水力侵蚀特性研究

炉渣对超细粒尾矿力学特性具有显著的影响,在超细粒尾矿中加入炉渣对改善坝体稳定性,提高尾矿库运行安全性具有重要作用。基于泥沙侵蚀理论,采用理论分析和室内试验深入分析了漫顶条件下超细粒尾矿—炉渣混合体的抗水力侵蚀特性。研究表明：不同炉渣含量条件下超细粒尾矿—炉渣混合体（以下简称“混合体”）在水力作用下,其侵蚀速率呈非线性变化规律。随着混合体中炉渣含量逐渐增加,侵蚀速率呈先减小后增大的变化模式,其中40%含渣量时混合体的侵蚀速率最小,即此刻混合体的抗侵蚀能力最强;混合体黏聚力降低对其抗侵蚀能力具有较大影响,内摩擦角变化对其抗侵蚀能力的影响相对较小。分析结果对于进一步研究尾矿坝水力侵蚀的影响具有一定的参考意义。

Study on the Hydraulic Erosion Characteristics of Flood Dams of Ultrafine Tailings-slag Mixtures

Slag has a significant impact on the mechanical properties of ultrafine tailings,and the addition of slag to ultrafine tailings plays an important role in improving dam stability and improving the operational safety of tailings reservoirs.Based on the theory of sediment erosion,theoretical analysis and indoor experiments were used to deeply analyze the hydraulic erosion resistance of ultra fine grained tailings slag mixture under flood top conditions.The study results showed that the erosion resistance of ultra fine tailings slag mixture (hereinafter referred to as mixture) under the condition of different slag content is nonlinear under the influence of hydraulic action.With the gradual increase of slag content in the mixture,the erosion rate shows a change mode of first decreasing and then increasing,of which the erosion rate of the mixture is the smallest when the slag content is 40%,that is,the erosion resistance of the mixture is the strongest at this moment.The reduction of the cohesion of the mixture has a greater impact on its erosion resistance,and the influence of the change of the internal friction angle on its erosion resistance is relatively small.The above analysis results has certain reference significance for further study of the impact of hydraulic erosion of tailings dams.