北江飞来峡工程纵向围堰渗流计算

北江飞来峡工程纵向围堰体及堰基的组成复杂。本文采用了有限元解拉普拉斯方程的方法解绘出不同上下游水位和高喷板墙不同渗流系数各种组合的等势线，并用当量渗流系数法计算了二十种不同上下游水位和堰体、堰基渗流系数组合的单宽渗流量，以及用局部流网法解出两组逸出比降和逸出流速。最后得出可供工程单位参考的结论和理论规律。

CALCULATION OF THE LONGITUDINAL COFFERDAM OF FEILAIXIA PROJECT IN BEIJIANG RIVER

The structure of the longitudinal cofferdam and its foundation of theFeilaixia project in Beijiang River is complicated.This paper first applies finiteelement methods to the solving Laplace equations and draws equipotential linesof nine combinations of different upperstream and downstream levels and unitof permeability of jet concrete wall partition, then utilizes equivalent unit ofpermeability to calculate unit discharge of twenty different combinations ofupperstream and downstream levels and unit of permeability of cofferdam and itsfoundation,and finally solves two groups of escape gradient and escape velocityby means of local flow net method. The conclusion of this paper can serve asimportant reference to project-undcrtaking unit.