铜矿尾矿料的力学特性  

Mechanical characteristics of copper mine tailings

作　　者：张林[1] 吴辉[1] 胡黎明[1] 杨超[2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]北京矿冶研究总院,北京102628

出　　处：《东南大学学报（自然科学版）》2016年第A01期45-50,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51579132)

摘　　要：尾矿的力学特性对于尾矿库的安全稳定分析十分重要．以国外某拟建铜矿尾矿库为研究对象，针对五种尾矿料开展渗透、压缩及静动力学试验，获得尾矿料的力学特性参数．试验结果表明：尾矿料的物理力学特性与其粒径组成紧密相关．压缩模量、渗透系数和抗剪强度均随尾矿粒径增大而增大．渗透系数随着固结压力增大而减小，其中全尾矿变化最明显．五种尾矿料均表现出剪胀性，具有较高的抗剪强度，有效应力内摩擦角为36°-40°．振动三轴试验结果表明，在同样的围压和动应力条件下，颗粒粒径越粗，振动破坏所需要的次数也越多．使用两种公式对孔压积累曲线进行拟合，对比其适用性．试验结果不仅为尾矿坝的设计和稳定性评价提供了必要参数，也为研究尾矿的工程力学特性提供了基础资料．The mechanical characteristics of tailings were important for the safety evaluation of tailing dams. The presented study investigated different properties of five different tailings obtained from a copper mine tailings pond,including conductivities and mechanics properties. The properties varied with the particle sizes of tailings. The coarse tailings showed lower compressibility, higher permeabili- ty and higher strength than the fine tailings. With the decrease of the void ratio, the hydraulic conduc- tivity decreased, and the unclassified tailings changed most. All the tailings displayed remarkable di- latancy and high strength, the effective friction angles were 36°-40°. According to the results of cyclic triaxial experiments ,the cyclic strength ratio （CSR） increases when the particle size of tailings increases. The pore water pressure corresponding curves are fit by two models. The experiments provide necessary information for the design of tailing dam, thus it is used for further investigation of the mechanical properties of tailing materials.

关 键 词：尾矿料 力学特性 动力特性 孔隙水压力 

分 类 号：TU411[建筑科学—岩土工程]