下司水库土石坝防渗加固措施探讨

Discussion on anti-seepage reinforcement measures of earth and rock dam of Xiasi reservoir

文中通过贵州省瓮安县下司水库工程实例,采用Plaxis有限元分析软件对此工程拟采用的几种方案进行了防渗性能研究。从造价、渗流稳定、耐久性能、施工难易、施工可靠度等方面综合比较选定最终方案。除险加固的工程往往都运行多年,坝前有淤沙,工程最终选择的方案是淤沙高程以上复合土工膜坝体防渗、淤沙高程以下充填灌浆与坝基帷幕灌浆的这种综合防渗体,既利用了复合土工膜的柔性好适合坝体沉降变形、造价低的优点,又利用了灌浆技术防渗效果好,耐久性好等优势,避免下挖淤沙,施工简便,在除险加固坝体中应用有很大优势。

Based on the example of the Xiasi reservoir project in Wengan County,Guizhou Province,the anti-seepage performance of the project is studied by using Plaxis finite element analysis software.The final scheme is selected from the aspects of cost,seepage stability,durability,construction difficulty and construction reliability.Project tends to run for many years and with silt sand in the front of the dam.project final selection scheme is composite geomembrane anti-seepage above silt elevation,filling grouting under silt dam body height and curtain grouting in dam foundation.This kind of composite impervious body uses both the flexibility of composite geomembrane suitable for dam settlement,the advantages of low cost,and good anti-seepage effect and good durability advantages of grouting technology,avoid digging silt under construction is simple,applied in the dam body seepage and consolidate has great advantage.