南水北调中线与安阳河交叉工程裹头体型优化

Configuration Optimization of Wrapped Head of Cross Project of Anyang River and Middlle Route of South-to-North Water Diversion Project

为改善南水北调中线总干渠与安阳河交叉工程口门处流态、水流结构,首先提出按椭圆弧曲线和复合圆弧曲线设计裹头体型的两种优化方案,然后利用导流水力学原理确定椭圆曲线和圆弧曲线有关参数,再从导流、施工放样、工程量、壅水几方面综合考虑,推荐按复合圆弧曲线设计的裹头体型的优化方案,最后对推荐方案进行模型试验验证。试验表明:基于导流水力学的口门裹头体型优化达到了基本消除回流或大大缩小回流的目的,且该处冲刷深度有所减小。从经济实用、安全可行方面考虑,按复合圆弧曲线设计优化的裹头体型为最优方案。

In order to improve the flow pattern caused by the side wall of the narrowed Anyang River channel in the cross engineering, which is formed due to the inverted siphon culvert of Mid-Route of South to North Water Diversion Project crossly passing through the Anyang River, two kinds of side wall configuration, namely, an ellipse curve and a composite arc curve, are proposed. On the basis of the theory of hydraulics and considering the other respect requirements of the project, an optimum configuration scheme involving a composite arc curve is recommended. And through the examination of hydraulic model test, the result indicates that, with the recommended composite are curve scheme, the return flow is basically eliminated, or large narrowed and the scouring depth is reduced. So, the recommended scheme is safe, economic.