考虑辐射井的栗西尾矿坝渗流数值分析

Radial well-considered numerical analysis on seepage of Lixi Tailings Dam

针对尾矿库区内浸润线高从而引发的安全性问题,为了有效排出尾矿内部的水,降低浸润线,结合栗西尾矿库工程实例,开展渗流数值仿真模拟,简化模拟了一种辐射井建模的方法,分析了增设辐射井设施前后对渗流结果的影响,包括坝顶处底部至顶部压力水头变化、浸润线位置的变化以及上游至下游总水头变化,并把计算结果和实测结果作了对比。综合结果表明:堆积坝顶处的压力水头由底部向顶部接近线性降低。对于同一节点来说,增设辐射井后,压力水头几乎不会随着干滩长度减小而变化,但坝内浸润线得到了有效降低。计算结果与实测浸润线作对比,增设辐射井后,浸润线和实测浸润线耦合较好,有着较小的误差,范围在0.1%~7.7%之间,较为合理。研究结果考虑了辐射井的影响,为尾矿坝的三维渗流分析提供了参考依据。

Aiming at the safety problem caused by the high saturation line in the tailings reservoir area,a numerical seepage simulation is carried out in combination with the actual engineering case of Lixi Tailings Reservoir for effectively draining the water inside the tailings out and lowering the saturation line,for which a simplified simulation is made on a radial-well modeling method,and then the influences before and after adding the facilities of radial-well on the result of seepage are analyzed,including the change of the pressure head from the bottom to the top of the dam crest,the change of the position of the saturation line and the change of the total head from the upstream to the downstream of the dam,while the calculated results are compared with the measured ones.The comprehensive result shows that the pressure head at the crest of the embankment dam is nearly linearly decreased from the bottom to the top.However,for the same node,the pressure head is almost not changed along with the decrease of the length of the dry beach after adding radial well,but the saturation line inside the dam is effectively lowered.Through comparing the calculation result of the saturation line with the measured one,it is indicated that the saturation line after adding radial well is well coupled with the measured one and the error is less with a range of 0.1%~7.7%,thus is more reasonable.The study result considers the effect of radial well,and then provides a referential basis for the 3-D seepage analysis made for tailings dam.