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采用固定网格有限元渗流分析方法 ,对溪洛渡水电站上游围堰防渗体发生裂缝等非常工况进行了三维全场渗流分析 ,并且提出了渗透坡降临界区的概念以评价围堰的渗透稳定性。计算结果表明 ,当防渗墙出现局部裂缝时 ,围堰的渗流量明显增大 ;在裂缝附近渗透坡降较大 ,但衰减较快 ,围堰渗流量和渗透稳定性与裂缝尺寸密切相关。
By using the finite element method of fixed-grid finite element analysis, three-dimensional full-field seepage analysis is carried out on the three-dimensional full-field seepage flow of fractures in the upstream cofferdam of the Xiluodu Hydropower Station. The concept of the critical area of the slope infiltration is proposed to evaluate the seepage stability of the cofferdam Sex. The calculated results show that the seepage flux of the cofferdam increases obviously when there is a local crack in the seepage prevention wall. The gradient of seepage near the crack is larger but the attenuation is faster. The cofferdam seepage and seepage stability are closely related to the crack size.