多层强透水地基渗流计算的应用研究

针对堤防透水地基范围大、呈多层水平分布、地形复杂的特性，通过越流补给建立各层透水层及地表间联系，结合双层强透水层减压井计算公式及改进井点修正方法，研制出多层水平二维(向)有限元程序。这是一种简化算法，忽略次要的强透水层垂向渗流及弱透水层的水平渗流，强调强透水层中的层间流动及层间越流补给主要特性，用二维方法较好地解决了三维问题。在北江大堤的多项实际工程中应用，解决了工程难题。

APPLICATION OF SEEPAGE CALCULATION FOR MULTI-LAYERED STRONG PERMEABLE SOIL

Aiming at the large area, the multi-layer level distributing, and the complicated terrain of the permeable foundation of levee, the finite element program is developed for two-dimensional seepage in horizontal plane with multi-layer medium. In the program, the relationships between each permeable layers and the surface are established through leakage through weak permeable layer, the bleeder well calculation formula of permeable double-layer and the modified method on well point. This is a predigested method using two-dimensional method to simulate three-dimensional problems. In the method, the vertical seepage of the strong permeable layer and horizontal seepage of the weak permeable layer are ignored, and the flow in the strong permeable layer and the leakage through weak permeable layer between two layers are emphasized. The proposed method is applied to several engineering practices of North River Levee, and some difficult engineering problems are solved.