三峡工程二期围堰防渗墙塑性混凝土特性

摘要

根据三峡工程二期围堰结构要求,提出了防渗墙墙体材料的技术指标。通过墙体材料筛选优化,推荐的塑性混凝土具有能适应堰体要求的各种性能。并对塑性混凝土进行了三轴测试和应力-应变计算分析以及现场监测,结果表明其性能达到了设计要求。经过一年多的运行考验,塑性混凝土防渗墙是安全的。%According to structural features of Three Gorges Project(TGP) cofferdam Ⅱ,technical indices of materials used for impervious core wall are presented. Through selecting and optimizing,the mix proportion of plastic concrete for core wall was recommended.Triaxial shear tests and stress-strain behaviour analysis were carried out on this material.In addition,laboratory study and in-situ monitoring results concluded that the properties of plastic concrete achieved all design requirements.Normal operation over one year proved the plastic concrete cut-off wall being safe.