面板坝止水失效后垫层料渗透特性的细观研究

Micro-study on Permeability Characteristics of Cushion Material after Water Stop Failure of Panel Dam

通过面板坝止水失效时发生集中渗流的建模计算、定量计算及试验进行面板坝止水失效后垫层料渗透特性细观研究。根据某面板坝垫层料的颗粒级配曲线采用PFC-2D软件生成细观模型,得出了不同压力差作用下垫层颗粒流量、孔隙率、流速及渗透系数等参数随时间的变化过程,并根据所记录的曲线形态分析了面板坝止水失效后垫层区的渗流特性及渗透稳定性。

In this paper,through modeling calculation,quantitative calculation and test of concentrated seepage occurring when the water stop failure of the concrete face dam,the seepage characteristics of cushion material after the water stop failure of the face plate dam are studied in detail.In this paper,according to the particle gradation curve of cushion material of a panel dam,a micro-model is generated by using PFC-2D software,and the variation process of parameters such as flow rate,porosity,flow rate and permeability coefficient of cushion particles with time under different pressure differences is obtained.According to the recorded curve shape,the seepage characteristics and seepage stability of the cushion area after the water stop failure of the face plate dam are analyzed.