库水位对尾矿坝重金属迁移影响的数值模拟分析

Numerical Simulation Analysis of the Influence of Reservoir Water Level on Heavy Metal Migration of Tailings Pond

以某尾矿库为例,开展尾矿库不同库水位对重金属Cu^(2+)迁移影响的数值模拟分析,得到不同库水位下重金属Cu^(2+)的迁移规律。结果显示,重金属在空间上随地下水发生沿初期坝方向的横向和纵向的迁移;随着尾矿库的堆积,尾矿库剖面上各粒子浓度得到补给,尾矿库中的重金属浓度逐渐增大;尾矿库重金属离子的迁移速度与其库水位高度呈正相关;在尾矿库设计最高库水位标高时的重金属Cu^(2+)迁移速度最快,7~7.5a到达初期坝。研究成果对指导现场尾矿库环境治理具有较大的现实意义。

The migration state of heavy metal pollutants in tailings ponds is greatly affected by the reservoir water level.Taking a tailings pond as an example,this paper carried out numerical simulation analysis on the influence of different water levels of the tailings pond on the migration of heavy metal Cu^(2+),and obtained the migration rule of heavy metal Cu^(2+)at different water levels of the tailings pond.The results showed that heavy metals migrated laterally and longitudinally along the direction of the initial dam with the groundwater in space.With the accumulation of tailings pond,the concentration of each particle on the profile of tailings pond was replenished,and the concentration of heavy metals in tailings pond increased gradually.The migration rate of heavy metal ions in tailings reservoir was positively correlated with the reservoir water level height.The migration rate of heavy metal Cu^(2+)was the fastest when the designed highest water level of tailings reservoir was raised,and it reached the initial dam in 7~7.5 years.The research results are of great practical significance to the environmental treatment of tailings pond on site.