刚性与塑性防渗墙组合在高土石坝中的应用

Application of combined anti-seepage wall with normal and plastic concrete in high earth dam

河南省窄口水库坝体心墙裂缝、坝基断层破碎带发育,渗漏严重,水库不能正常运行。通过研究分析,决定采用坝体混凝土防渗墙、两坝肩帷幕灌浆、坝顶648.0 m高程以上拆除重建的处理方案,对大坝进行全面除险加固。防渗墙采用刚塑性混凝土组合方案,上部采用塑性混凝土,下部采用普通混凝土。从施工后的坝体安全监测数据及三维非线性有限元分析结果看,刚塑性组合混凝土防渗墙很好地适应了坝体变形,满足设计防渗要求。

Severe seepage induced by development of core - wall crack and fault fracture zone in the dam foundation was investigated at Zhaikou Reservoir in Henan Province. After comprehensive analysis, a thorough reinforcement solution is determined as follows： adopting concrete anti -seepage wall while conducting curtain grouting in the dam abutment, and removing and rebuilding the dam body higher than elevation of 648.0 m. A combination of normal concrete and plastic concrete is adopted for the anti - seepage wall, which is arranged at lower elevation and higher elevation respectively. By analyzing safety monitoring data after construction and conducting 3D nonlinear FEM analysis, it is noted that the combined anti -seepage wall can fully adapt to dam deformation and meet the requirement of impervious design.