溪洛渡水电站上游围堰渗流分析及防渗型式比较

Seepage Analysis for Upstream Cofferdam of Xiluodu Hydropower Station

本文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五种防渗结构型式进行了二维和三维渗流分析 ,分析结果具有良好的规律性 ,表明了该方法的可靠性。计算结果表明碎石土斜心墙防渗型式的抗渗性能要优于土工膜斜墙防渗形式。一般的土石坝渗流分析需要考虑基岩透水性较强部分空间分布的三维特性。

Based on 3D seepage model of saturated unsaturated flow for non uniform soils, a fixed mesh FEM was used in the seepage analysis for upstream cofferdam of Xiluodu hydropower station including five seepage control styles. The method was confirmed effective and feasible by good regularity of the results. It was concluded that the seepage control capacity of soilaggregate sloping core wall has an advantage over that of geomembrane sloping wall. It is necessary to apply 3D seepage analysis for the dams whose distribution of seepage path exhibits evident 3D characteristics.