高堆尾矿坝堆积特性及三维渗流数值分析研究

栗西尾矿坝深钻孔勘探试验指标统计及多种原位测试结果分析表明,高堆尾矿坝深部的干容重指标要显著高于浅部,堆积坝体同一空间位置,同样埋深下干容重指标具有随时间明显增长的规律.提出了高堆尾矿坝稳定性分析中对同一类尾矿材料(如尾中砂、尾粉砂),可按早、中、后期分区统计选取力学指标的观点.采用改进子排水结构法精细模拟尾矿坝密集排水孔,采用减小干区渗透系数的不变网格模拟分析方法处理浸润面之上的虚拟流动,得到更加接近实际的尾矿坝三维渗流数学模型.采用复杂三维渗流控制分析计算程序,反演分析了现状坝高135 m的渗流场、浸润线及渗流量.计算分析结果与勘察剖面地下水位、观测总渗流量比较一致,误差不大于13%.同时表明在辐射井排渗系统作用下,可显著降低尾矿坝体潜水面,因此建立的渗控模型,可以应用于后期加高的计算分析中.

Seepage Parameter Selection and Three dimensional Seepage Inverse Analysis for Lixigou High Stack Dam

Index statistic on deep borehole prospecting test and verification of various in situtests in Lixigo uindicate that deep part survey index of high tailing dam is greater than shallow part.Under the circumstance of the same spatial location and the same depth of piling dam body,gravity index increases significantly with time.Physical indexes are selected by the early,middle,and late stages in the stability analysis of high tailing dam for the same material(medium sand silt).Improved drainage structure method is adopted to simulate densely dist ributed drainage holes.By using complex three dimensio nal seepage soft ware(SP GCR 3.FOR),the inverse analysis of sat uration line and seepage discharge is made for a status dam of a height of 135 m.According to the fitting inverse analysis of drainage and seepage facilities,the mat hematical model which conforms to the reality is obtained.The outcome from the analysis mentioned above coincides with the groundwater level in t he survey section and observed seepage discharge,with the error less than 13%.Accordingly,the seepage model and stack pile sedimentary seepage parameter are found,which can be applied to the analysis of dam heightening in late stage.It also demonst rates that radial wells can lower saturate line obviously.