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以金川面板堆石坝为例,用有限元方法计算了当面板缝及止水局部失效时各种工况下的渗流场,系统分析了大坝在面板垂直缝及止水局部失效后的稳定渗流场的规律和特点。采用无厚度的二维平面单元来模拟面板垂直缝及止水结构周边缝,同时采用理论上严密的Signorini型变分不等式方法进行求解,此方法能对渗流出渗点和浸润线进行准确定位。通过分析计算结果,指出了面板缝及止水结构周边缝的失效位置,失效缝宽对等势线、浸润线以及渗漏量的影响。为面板堆石坝接缝的设计提供参考。
Taking Jinchuan face rockfill dam as an example, the seepage field under various working conditions when the face slab joints and the local failure of water stop were calculated by the finite element method. The stability of the dam after the local failure of vertical joints and water stop of the face plate was systematically analyzed The rules and characteristics of seepage field. The non-thickness two-dimensional planar element is used to simulate the vertical seam of the panel and the perimeter seam of the water stop structure. Simultaneously, a theoretical rigorous Signorini-type variational inequality method is used to solve the problem. This method can accurately locate the infiltration point and the infiltration line. Through the analysis of the calculation results, the failure location of the perimetral joints of the panel sewer and the water stop structure, the influence of the failure slot width on the equipotential lines, the saturation line and the leakage amount are pointed out. It provides a reference for the design of concrete facing rockfill dam.