酸碱溶液作用下尾矿砂压缩特性的试验分析

Under the action of acid and alkali solution of tailing deposit soil compression characteristics of the experimental research

为研究不同pH值酸碱溶液对尾矿砂压缩特性的影响,通过应用自行研发的固结渗透装置,对采自辽宁省铁岭市红印尾矿库尾矿砂进行试验研究,测得不同pH值酸碱溶液浸泡后的尾矿砂孔隙比,压缩系数及压缩模量等参数随pH值变化的规律,结果表明:酸碱溶液浸泡后的尾矿砂在固结压力的作用下,初期变化速度很快,然后逐渐趋于平稳;且酸溶液浸泡后的尾矿砂孔隙比最小,蒸馏水浸泡后的尾矿砂孔隙比最大;酸(碱)溶液pH值与尾矿砂压缩系数呈单调递增(减)关系;酸碱溶液浸泡过尾矿砂的压缩模量比原状土大。实验所得的这些参数随pH值变化规律为研究尾矿坝整体稳定提供了一定的理论依据。

This study compares the results from compression ratio of mine tailing in different pH values of acid solutions.By employ of self designed consolidation and osmotic device from Hongyin Mine Tailing Dam,Tieling City,Liaoning Province,China,examination of samples over the scale of void ratio by depositing tailings into acid-based solutions in different pH values revealed patterns in terms of compression ratio and compression modulus factors.Experimental results indicate that: Under consolidation pressure,the pressure level of tailings that were soaked in acid solutions varied fast at beginning and became stabilized after certain time.In addition,the pore ratio of the tailings were lower than the one soaked in distilled water;the compression coefficient monotonically decreases while pH value of acid solution increases;And the compression modulus ratio of the soaked tailing was larger than the original ones.Therefore,these experimental results provide ground theoretical reference in the study of overall stability of tailing dam.