湖北三里坪电站右岸渗漏地段防渗对策

Countermeasures for treatment of seepage section at right bank of Sanliping Hydropower Station

三里坪水电站右岸河湾地块存在水库蓄水后向下游渗漏的可能。通过对渗漏地段水文地质条件的分析,确定了河湾地块各可疑渗漏地段的渗漏可能性,提出了防渗处理措施:对于大坝至石牌组隔水层之间天河板组下段的防渗处理,应将坝肩防渗段向上游延伸,并与石牌组页岩相接;而对石牌组隔水岩组分布地段,特别是对强卸荷岩体区出现的岩体透水性明显增大的三角地带,尤其是大坝帷幕延伸段端头部位,防渗帷幕要与新鲜完整的石牌组页岩相接才能保证帷幕封闭的有效性。

At the river bend of right bank of Sanliping Hydropower Station,it is possible that the seepage towards the downstream would occur after the impoundment of the reservoir.Through analysis of hydrological and geological conditions of the seepage section,the seepage possibility of the possible section was determined.And it is proposed that for seepage treatment of the lower section of Tianhe plate that between the dam and Shipai aquifuge,anti-seepage section of the dam should be extended to the upstream and connected with the Shipai shale.As for the section where the Shipai aquifuge distributed,namely the triangle area of strong unloading rock mass zone where the permeability of rock mass increases obviously,especially extended end of the anti-seepage curtain,the curtain of dam should be connected with the Shipai shale,so as to ensure the effectiveness of closed curtain.