南京江宁区长江干堤应急加固渗控方案

Seepage Control Scheme of Emergency Reinforcement for Yangtze River Main Dike in Nanjing

基于稳定饱和渗流基本理论,采用等效连续介质模型,建立了南京市江宁区长江干堤有限元模型,对垂直防渗墙、黏土铺盖、排水褥垫以及深层搅拌桩等4种渗流控制措施进行了分析和比较,并计算了堤体及周围土体的渗流特性和渗透破坏情况。计算结果表明,采用(混凝土)防渗墙和利用深层搅拌桩处理可达到堤防防渗和加固的效果。

A finite element model of the Yangtze River main dike was developed based on the case study and the basic theory of the steady saturated seepage,and the equivalent continuous media model was applied in the model development.The model was used to analyze and compare four different seepage control measures,including the vertical cut-off wall,clay blanket,drainage cushion,and deep mixing pile,and was also used to calculate the seepage characteristics and seepage failure of the main dike and its surrounding soil.The results showed that using the concrete cut-off wall and deep mixing pile can solve the seepage control problems of the dike and thus ensure the embankment safety to pass the flood.