尾矿含水率的变化对尾矿的抗剪强度有很大的影响,研究它们之间的变化规律对工程实践有着重要意义.该文以云南某铜矿的尾矿为研究对象,在分析其基本物理特性的基础上,通过直剪试验研究了在相同压实度条件下含水率对尾矿抗剪强度特性的影响.其结果表明:尾矿的抗剪强度与初始含水率存在相关关系;当尾矿含水率从6.30%增加到18.31%时尾矿的黏聚力随着含水率的增加而增大,当尾矿含水率从18.31%增加到24.14%时尾矿的黏聚力随着含水率的增加而减小;而在尾矿含水率从6.30%到24.14%变化过程中,内摩擦角总体上先增加后减小,但仅在24.64°~26.24°变化,有明显的峰值.通过回归分析,得出了尾矿黏聚力随着含水率变化的拟合公式.该研究成果对尾矿库的稳定性分析具有重要的指导意义.
The change of water content has a significant influence on shear strength of tailings,and it's important to study the relationship between them for engineering practice.In this paper,taking the tailings from a copper mine in Yunnan as the research object,and based on the analysis of physical properties of the tailings,influence of water con-tent on the shear strength of the tailings under the same degree of compaction conditions is analyzed.The results indi-cate that there exists considerable relevance between the shear strength and the initial water content.When the water content increases from 6.30 %to 18.31 %,the tailings cohesion increases with it;when the water content increases from 18.31 %to 24.14 %,the tailings cohesion decreases;while in the whole process of the water content changing from 6.30%to 24.14%,the internal friction angle is reduced after the first increase,but just varies between 24.64° and 26.24°,which has distinct peaks.The fitting formula of tailings cohesion with the changing of water content is ob-tained through regression analysis.The results have guiding significance for the stability analysis of tailings ponds.
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