沙牌高RCC拱坝渗流特性及对坝肩稳定性的影响

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。

Seepage FlowCharacteristics of Sapai RCC ArchDam and Its Influence to Dam Stablilty

Sapai RCC arch dam is one of the principal engineering projects in the national eighth-five and ninth-five year plan.Due to the relatively thin dam shoulder and the presence of the green schist which becomes soft in water,the seepage flow and its influcnce to the project has come to be an inportant problem.Using 3D seepage flow finite element model,and in accordance to the anti-seepage design,the seepage pressure field and the seepage flow rate in the dam drainage gallery are computed for various working condition of the water-tight screen and drainage conduit.The influence of the seepage flow to the dam stability is also evaluated.