本文介绍某大型电排站地基与土坝组合体的三维渗流数值计算及有关方法,该项工作的目的在于应用有限单元法解决较复杂的工程问题。文中阐述了如何处理有压流和无压流同时存在的三维非均质渗流场,介绍了求自由面与伸入式排水体交线位置的插值方法,三维自由面和渗出面的自动鉴别和调整方法以及应用“分块平移法”解线性代数方程组,充分利用磁盘(带),使中、小型计算机能解数千、上万结点的大规模问题。 This paper introduces the numerical calculation and related methods of three-dimensional seepage flow of a large-scale electric drainage station foundation and earth dam combination. The purpose of this work is to use the finite element method to solve more complex engineering problems. This paper describes how to deal with three-dimensional inhomogeneous seepage fields with both pressure and no-pressure flow. The method of interpolating the position of the free surface into the drainage body is introduced, and the automatic identification of the three-dimensional free surface and the seepage surface is introduced. The method of adjustment and application of “block translation method” to solve linear algebraic equations, make full use of disk (band), so that small and medium-sized computers can solve the large-scale problems of thousands, tens of thousands of nodes.