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沙牌高ＲＣＣ拱坝是国家“八·五”和“九·五”科技攻关项目重点依托工程，由于拱坝坝肩相对单薄，坝肩岩体中存在遇水易于软化的绿片岩，坝址区的渗流特性及对坝肩稳定性的作用与影响是工程非常关心的问题，本文根据沙牌坝址区水文地质条件及坝基防渗处理设计措施，运用三维有限元数学模型，研究坝基（ 肩） 渗透压力的空间分布特征及坝基排水廊道的渗透流量，并针对坝基防渗帷幕和排水孔幕不同施工质量，对坝基渗流特性及坝肩稳定性的作用与影响进行敏感性分析。
Shapaigao RCC arch dam is a national key project relying on the “August 5” and “September 5” key scientific and technological projects. Due to the relatively thin dam abutment, there are green schist that is easily softened in the abutment rock mass, and the dam site According to the hydrogeological conditions of Shapai dam site and design measures of anti-seepage treatment of dam foundation, three-dimensional finite element mathematical model is used to study the effects of dam seepage ) And the seepage flow rate of dam foundation drainage corridor. According to the different construction quality of seepage curtain and drainage hole curtain of dam foundation, the sensitivity analysis on the seepage characteristics of dam foundation and the effect of dam abutment stability is carried out.