抽注流量分配及抽注比对地浸溶液扩散的影响

摘要

根据新疆某铀矿床4#采区地质、水文地质条件以及地浸钻孔数据,运用地下水数值模拟软件VisualMODFLOW建立地浸溶液渗流与溶质运移模型,研究了抽注流量在采区各钻孔的不同分配方式以及不同抽注比对地浸溶液渗流运移的影响.结果表明:影响地浸溶液向采区外围扩散的主要因素是采区单孔流量的分配方式,即采区单孔流量的空间分布状况;在抽注流量分配方式一定的情况下,采区总抽注比的变化对溶液扩散的影响并不明显.加权平均方法可使采区各局部的抽注流量分配更均衡,采区以3 840m3/d的总抽液规模、抽注比为1.0005运行5 a,地浸溶液向外围扩散的范围不超过200m,采区下游是溶液扩散外流的主要区域,需要重点关注.无论是从控制溶液外流的角度,还是从采场均衡浸出的角度,更应该关注采区各钻孔的流量合理分配和各子单元的抽注平衡,而非采区的总体抽注比.%According to the geological and hydrogeological conditions,as well as the drilling datas for a uranium stope in Xinjiang,the groundwater numerical simulation software Visual MODFLOW is used to establish the in-situ leaching solution seeping and solute moving models.The influence of solution seeping and solute moving owing to different distribution modes and different drawing injection proportion are studied.The results show that the main factor of in situ leaching solution diffusing to stope periphery is the distribution mode of single hole flux,i.e.the spatial distribution of single hole flux.If the drawing injection flux allocation is determined,the change of total drawing injection proportion to solution diffusing effect is not obvious.The weighted average method can make the drawing injection flux to balance.The stope runs five years,total drawing of 3 840 m3/d and drawing injection proportion 1.000 5,the in-leaching solution is diffused to periphery about 200 meters.The downstream of stope is the solution diffused main areas that need adverted especially.Whether from the angle of solution diffusion,or from balanced leaching,the flux distribution mode as well as each unit drawing injection balance will be a focus,rather than the overall drawing injection proportion at the mining area.