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根据不同方法判定甘肃省某电站坝基覆盖层的渗透变形型式、临界坡降和允许坡降,取得了较合理的渗透变形参数。采用有限元法计算坝基渗流场,分析了其渗透变形特征。结果表明,水库正常蓄水后,在渗流条件下坝基覆盖层将发生渗透变形破坏,对此提出了较合理的防渗措施,可为未来利用深厚覆盖层建坝的水电工程渗透变形处理问题提供参考。
According to different methods, the deformation type, critical gradient and allowable gradient of overburden on the dam foundation of a hydropower station in Gansu Province were determined, and more reasonable parameters of seepage deformation were obtained. The seepage field of dam foundation is calculated by finite element method, and its infiltration deformation characteristics are analyzed. The results show that the seepage deformation and failure of the dam foundation under seepage conditions will occur after the reservoir is normally impounding, and a more reasonable seepage prevention measures are proposed, which can provide a solution to the problems of seepage deformation treatment of hydropower projects using deep overburden in the future reference.