龙滩碾压混凝土重力坝的防渗研究

系统地阐述了高碾压混凝土重力坝渗流分析和防渗结构研究的必要性，介绍了龙滩高碾压混凝土重力坝各分区材料的渗流特性，并进行了渗透溶蚀性研究和临界水力梯度研究。证明优化的料配合比，能满足龙滩192m/216.5m高大坝的防渗与耐久性要求。对大坝的防渗结构，主要研究了钢筋混凝土面板防渗方案、变态混凝土与二级配碾压混凝土防渗方案和沥青混合料防渗方案。通过温控与防裂的分析计算、结构应力与稳定分析计算和大坝渗流分析计算等多方面综合比较，以变态混凝土与二级配碾压混凝土防渗方案最优，推荐为首选方案，而沥青混合料具有很好的防渗效果，并具有保温作用，且对温控防裂十分有利，建议作为比选方案，对今后需进一步研究的课题提出了建议，无疑对已开工建设的龙滩工程具有重要的参考价值。

Study on Seepage Control for Longtan RCC Gravity Dam

This paper discusses systematically the necessity of seepage analysis and seepage control study for high RCC gravity dam,recommends the seepage characteristics of material for different zones of Longtan RCC dam and studies the seepage dissolving character and critical hydraulic gradient.It proves that optimal concrete mix can meet the requirements for both seepage control and durability of 192m/216.5m high dam.For seepage control structures,this paper focuses on the reinforced concrete facing,the anomalous concrete with two grade concrete facing and the bituminous mix facing.Based on temperature control,crack control structural stress and stability analysis as well as dam seepage calculation,the anomalous concrete with two grade conerete facing is optimal and is recommended.Bituminous mix possesses good seepage control and,heat insulation property which is very good for temperature and crack control,therefore it is suggested as a comparable one.This paper,which suggests some topics for further research is doubtlessly important for the Longtan project now under construction