尾矿库初期坝排渗能力对渗流场浸润线影响

Effect of tailing pond starter dam drainage capacity on seepage field saturation line

为分析初期坝的排渗能力对浸润线的影响程度,采用数值模拟方法对初期坝在不同排渗能力下浸润线的位置进行研究.在将尾矿坝基本剖面概化的基础上,采用GeoStudio的地下水渗流分析模块SEEP/W对初期坝在不同排渗能力时浸润线的位置进行数值模拟.首先构建尾矿坝基本剖面概化模型;然后分析尾矿库初期坝在不同排渗能力下对于浸润线高度的影响.研究结果表明:当初期坝排渗能力降低10倍时,浸润线与初期坝上游坡面交点距坝底的距离为1.7 m,即初期坝排渗能力对浸润线影响明显;随着初期坝排渗能力降低,浸润线位置逐渐被抬高,并最终从堆积坝的坝坡溢出,严重影响尾矿坝稳定性.该研究成果可对尾矿库设计和管理提供理论依据和技术支撑.

In order to analyze the effect of the starter dam drainage capacity on seepage field saturation line, the numerical simulation was taken to study the position of seepage line of the starter dam under the different drainage capacities. On the basis of tailing pond basic profile being generalization, the position of seepage line of the starter dam at different drainage capacity was made by numerical simulation using the GeoStudio groundwater seepage analysis module called SEEP/W. Firstly, the model of tailing pond basic profile being generalized was structured. Then, effect of the tailing pond starter dam on the height of seepage line at different drainage capacity was analyzed. Results of the study show that when the drainage capacity of the starter dam was decreased by 10 times, the distance between the base and the intersection of seepage line and the starter dam upstream slope was 1.7m, the seepage line was influenced remarkably by the drainage capacity of starter dam. Allowing with the decrease of the drainage capacity, the position of seepage line was elevated gradually and overflew from the embankment dam slope, which influenced the stability of tailing pond seriously. Through the investigation of the effect of drainage capacity of the starter dam on seepage line with this method, the theoretical basis and technical support can be provided to the design and management of tailing pond.