茨哈峡水电站垫层料与过渡料联合抗渗试验研究

Combinated seepage failure tests on cushion and transition materials for Cihaxia Hydropower Station

对于天然砂砾石料作为筑坝料的超高混凝土面板堆石坝工程,其坝体各分区料联合抗渗稳定性对坝体安全性十分重要。研究采用自主研制的高水头大型渗透试验设备,对茨哈峡水电站原级配砂砾石填筑料的垫层料与过渡料进行联合抗渗试验;监测各分区填筑料的渗流特性演变过程,总结了垫层料与过渡料筑坝料联合抗渗试验的演变基本规律,验证过渡料对垫层料的反滤保护作用,为茨哈峡水电站坝体填筑料的级配设计优化、渗透稳定安全性的论证提供了数据参考。

For the ultra-high concrete face rockfill dams,natural sand and gravel materials are used as the dam materials for rockfill dam projects.The combined impermeability stability of the dam partition materials is very important to the dam safety.In this study,the self-developed high-head large-scale permeability test equipments are used to conduct the combined seepage failure tests on the sand and gravel dam materials for Cihaxia Hydropower Station.The evolution process of seepage characteristics of the filling materials in each district are monitored.The anti-filtering protection effects of the transition materials on the cushion materials are verified.The results may provide data reference for the optimization of gradation design of dam filling materials of Cihaxia Hydropower Station and the demonstration of seepage stability safety.