栗西尾矿坝三维渗流预测与控制研究

Three-Dimensional Seepage Prediction and Control of Lixi Tailings Dam

尾矿坝稳定控制的关键问题之一是渗流控制。依据三维渗流模型,采用三维渗流控制分析计算程序SPGCR-3.FOR,在利用观测资料进行模型校正的基础上,预测了规划坝高195 m情况下的渗流场分布,结果显示,在现有排渗条件下尾矿坝体坡面存在地下水位溢出部位,不能保证尾矿坝的渗透稳定。通过模型预测分析,尾矿库干滩长度和排渗辐射井的数量是控制尾矿坝稳定的两个重要因素,在满足坝体内地下水潜水位埋深一定深度条件下,需要新增加10口辐射井排水,尾矿库干滩长度应保持在600 m以上,联合使用这些措施可确保尾矿坝稳定和安全。

The seepage control in tailings dam is a key problem of tailings dam stability. In this paper, authors have carried out analysis of three-dimensional seepage field in Lixi tailings dam by using three-dimensional seepage analysis software with FORTRAN code SPGCR -3. FOR. Based on the seepage model calibrated by measured data, authors have predicted seepage field under the height of planned dam. The result has shown that water table in tailings dam will reach slope surface and it can not assure the stability of the tailings dam under existing drainage facilities and drought beach with of the tailings pool. Through the model prodictation with 3D seepage analysis under more than 6.0 meters of water table depth in the tailings dam, authors have proposed how to keep the stability and determine the type, number of the drainage facilities. It suggests that it＇ s better to maintain more than 600m of drought beach width and to increase 10 radial wells with large diameter to assure the saftety of the tailings dam.