湖南株树桥水库大坝的变形研究

Research on dam deformation of Zhushuqiao reservoir

株树桥水库大坝为我国第一批兴建的面板坝工程,工程运行以来,大坝存在着坝肩变形较大而使周边缝止水破坏,水库出现渗漏;大坝沉降量大且上下游坝体沉降差较大等方面的变形问题,分析原因有:①两岸贴坡面板周边缝处,岩石基础坡面与填筑料坡面的过渡,存在填筑料厚度过小或者突变情况;②坝体填筑料特性差异较大;③施工时对特殊垫层压实度不够。

Zhushuqiao reservoir dam is one of the first group of concrete faced rockfill dams constructed in China. Since its operation, the comparably large crack at dam abutment damaged watertight seal at peripheral joint and leakage of the reservoir began. The dam settlement and settlement difference between dam upstream and downstream are rather large. Through analysis, the causes are:① under the face slab near the peripheral joint on both banks, the backfill material thickness is too small or suddenly changes; ② the feature difference of dam body backfill materials is comparably larger; ③ the compaction degree of special cushion layer was low.