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| 摘要: |
| 在深覆盖层地基上修建高土石坝,其防渗体系的可靠性是一项关键技术问题.防渗墙与土质防渗体连接处是抵御渗透破坏的关键部位.根据瀑布沟土石坝防渗体系的结构特点,利用有限元方法对瀑布沟土石坝进行了渗流分析.结果表明:坝体渗流与应力变形计算时,副防渗墙按40％承担水头较为合适;连接部位的渗透坡降是非均匀变化的,混凝土结构顶部的渗透坡降较大,心墙底部出口处的渗透坡降较小;坝体与两岸相接部位心墙底部渗流出口处的坡降最大.研究结论可以为类似工程提供参考和借鉴. |
| 关键词: 防渗结构 渗流 渗透坡降 瀑布沟水电站 |
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| Seepage analysis of Pubugou high earch-rockfill dam |
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| Abstract: |
| The reliability of seepage prevention system is a key problem for high earth-rockfill dam located in a
foundation of large overburden depth. The conjoining area of the anti-seepage soil body and the concrete diaphragm
wall is a key part against seepage induced failure. According to the characteristics of the seepage prevention system
of the Pubugou earth-rockfill dam, a finite element method (FEM) is applied to analyze the seepage flow of the
whole dam. The analysis results show that the appurtenant impervious wall taking 40% water head is suitable, and
that the seepage gradient in the conjoined area is inhomogeneous around the concrete structure. The seepage
gradient at the top of the structure is much bigger than that at the outlet of the earth core wall base. The analysis
results can be taken as the references for similar projects (works) in the future. |
| Key words: seepage prevention structure seepage seepage gradient Pubugou hydroelectric project |
