干湿循环作用下尾矿砂的强度特性试验研究

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.

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

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.