干湿循环作用下尾矿砂的强度特性试验研究  

Experimental Research on Strength Characteristics of Tailings Sand under the Effect of Wetting and Drying Cycles

作　　者：汤运昌 张志军[1,2] 安鹏飞 窦枚琦 周航 TANG Yun-chang;ZHANG Zhi-jun;AN Peng-fei;DOU Mei-qi;ZHOU Hang(School of Nuclear Resources Engineering,University of South China,Hengyang,Hunan 421001,China;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang,Hunan 421001,China)

机构地区：[1]南华大学核资源工程学院,湖南衡阳421001 [2]南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001

出　　处：《南华大学学报（自然科学版）》2018年第1期10-14,共5页Journal of University of South China：Science and Technology

基　　金：国家自然科学基金资助项目(51774187,51374129);湖南省科技厅重点研发计划项目(2017SK2280);湖南省自然科学基金项目(2018JJ3448);湖南省教育厅重点科研基金项目(17A184);衡阳市社会发展科技支撑计划项目(2014KS28);南华大学校级创新团队计划项目(NHCXTD04)

摘　　要：以湖南省某铅锌矿山尾矿库为研究对象,将取回尾矿重塑后进行6次干湿循环过程,并将经历干湿循环后的尾矿进行剪切实验,探讨反复干湿作用对尾矿力学特性的影响.结果表明:经过干湿循环作用后的尾矿,其应力—应变关系曲线发生了不可逆转的变化;通过对应力—应变关系曲线的分析得出,试样的偏应力峰值随着干湿循环次数的递增而变大,但经历过三次干湿循环作用后其数值趋于稳定;同时经历多次干湿循环尾矿的残余偏应力较未经历干湿循环尾矿提高近31.60%,其破坏后承载能力明显增强.Taking a lead-zinc mine tailing dam in Hunan Province as the research object,the tailings were recovered and then subjected to 6 cycles of wet-dry cycling.The tailings after the wet-dry cycle were subjected to shear experiments to investigate the effect of repeated wetting and drying cycles effect on tailings mechanical properties.The results show that the stress-strain curve of the tailings undergoes irreversible changes after the wet-dry cycle.Through the analysis of the stress-strain curve,the peak value of the deviatoric stress of the tailings increases with the number of wet-dry cycles,but its value tended to be stable after three cycles of wetting and drying.At the same time,the residual deviatoric stress of the tailings undergoing multiple wetting and drying cycles increased by nearly 31.60%compared with that of the tailings without wetting and drying cycle,its ability significantly enhanced.

关 键 词：干湿循环 力学特性 应力-应变关系曲线 

分 类 号：X936[环境科学与工程—安全科学]