土工席垫与排渗墙相结合的尾矿库渗控效果分析

Evaluation of seepage control effect of drainage wall and geotechnicalmat combined system of tailings pond

目的:土工席垫具有良好的集水和排水作用,但尾矿库在长期运行后,土工席垫经常出现因淤堵而失效的现象,这会导致坝体内部排水不充分,浸润面升高,进而增加渗透破坏的可能性,为此提出增设排渗墙来解决土工席垫失效引起的排渗安全问题。方法:以某尾矿库工程为例,采用饱和-非饱和渗流计算理论,计算分析了土工席垫不同失效程度下以及增设排渗墙后渗流场的变化。结果:结果表明:随着土工席垫失效程度逐渐加深,尾矿库坝体内部浸润线会逐渐升高,直至不能满足渗流控制要求。结论:在增设排渗墙后,可以有效控制坝体内浸润线埋深,提高坝体的排渗能力,满足安全要求。

Purpose:Geotechnical mat has good water collection and drainage functions.However,after long-term operation of tailings pond,geotechnical mat is often failed due to clogging,which will lead to insufficient drainage inside the dam body and an increase in the infiltration surface,thereby increasing the possibility of seepage damage.Therefore,it is proposed to add drainage walls to solve the drainage safety problem caused by the failure of geotechnical mat.Method:Taking a tailings pond project as an example,the saturated-unsaturated seepage calculation theory was used to calculate and analyze the changes in the seepage field under different degrees of failure of the geotechnical mat and after the addition of the drainage wall.Result:The results show that as the geotechnical mat failure gradually deepens,the infiltration line inside the tailings dam will gradually increase until it cannot meet the seepage control requirements.Conclusion:After adding drainage wall,the burial depth of the infiltration line in the dam body can be effectively controlled,the drainage capacity of the dam body can be improved,and the safety requirements can be met.