某混凝土面板堆石坝止水失效后的渗流场分析

Seepage Field Analysis of Concrete Faced Rockfill Dam Due to Water Stop System Failure

以某混凝土面板堆石坝为例,运用有限元数值计算方法,研究了周边缝失效以及垂直缝的失效位置、失效缝宽、失效缝长对坝体内的浸润面、渗透流量、渗透坡降等的影响规律,判断出面板失效缝区下方垫层、过渡层的渗透坡降和渗透稳定性。结果表明,缝宽相同时垂直失效缝位置越低以及垂直缝位置相同时失效缝宽度越大时,失效缝区的渗流量越大,坝体越不稳定;特殊垫层区的渗透系数对周边缝的渗流量、渗透坡降影响较大。

Taking a certain concrete face rockfill dam （CFRD） for an example, the finite element numerical calcula- tion is used to studying the impact of peripheral joint failure, the location, width and length of vertical joint failure to seepage face, seepage flow and seepage gradient. And then the seepage gradient, seepage stability of cushion layer and transition layer below the failure joints zone are judged. The analysis results show that the lower the position of vertical joint and the larger the width of the failure joints are, the seepage flow of failure joints zone is larger and the dam is more unstable; the permeability of special cushion layer may greatly affect the seepage flow and seepage gradient of peripheral joint.