过水堆石围堰溢：渗流规律的研究与计算

通过对混凝土板护面过水堆石围堰结构组成特性及溢流时水力状态的分析，给出了描述堆石围堰过水时堰体内外溢－渗流规律的控制方程，确定了非线性渗流表达式中各项系数的计算式及其物理意义，并建立起计算溢－渗流场的相应数学模型。在计算分析中，对垫层与排水孔的作用采用了相应的数学处理方法，使得理论分析与围堰实际工况比较接近。本文提出的公式与方法简单明了，计算结果与模型试验测值吻合良好，具有一定的实际意义。

Study on the law of spillage/seepage flows through a rock fill cofferdam

After analysing structural composition properties of an overflow concrete face slab rockfill cofferdam and its water flow regime overflowing,the governing equation for describing the law of spillage/seepage flows through a rock fill cofferdam is obtained,and the formulae of calculating various coefficients in the expression of a non-linear seepage flow and their physical meaning are determined,and a mathematic model for calculating overflow/seepage flow fields is established. In concrete calculation,the effects of cushion and drainage holes are considered by means of mathematic tools,which leads to the theoretic analysis comparatively approaching to the actual operation status of the cofferdam.The method and formulae proposed in this paper are concise,and the calculating results by them are better in agreement with those obtained by model experiment.Thus,this method has certain practical meaning.