论文部分内容阅读
滹沱河倒虹吸工程是南水北调中线总干渠河北省段穿河建筑物最重要的工程之一。穿河建筑物所在河段宽浅、主流摆动不定、河床冲淤变化无常。通过资料分析、物理概化模型及计算等方法,分别就穿河建筑物所在河段的河床冲淤演变、河道水流流态口门位置、口门型式和宽度、倒虹吸工程下游局部冲刷及两岸防洪等方面进行了模型试验研究。通过试验分析比较,了解了洪水过程中主河槽游荡的趋势,确定工程口门宽度为2000m,工程口门位置上、下游的冲刷及回淤情况和裹头附近的冲刷深度,并将总干渠“S”曲线段改为直线段,减轻了口门附近梨型导流堤局部的冲刷强度。为设计提供了依据,并可供同类工程设计参考。
Hutuo River inverted siphon project is the South-to-North Water Diversion Central Canal General Duanhe River building one of the most important projects. River where buildings across the river is shallow, the mainstream fluctuating, riverbed ebb and flow change. Through the methods of data analysis, physical generalization model and calculation, the ebb and flow evolution of the riverbed in which the river crossing the river is located, the position of the river mouth, the type and width of the port gate, the local scour downstream of the inverted siphon project, Flood control and other aspects of the model test study. Through experimental analysis and comparison, we understand the wandering tendency of the main channel in the course of flood, determine the gate width of the project entrance to 2000m, the situation of erosion and siltation upstream and downstream of the mouth of the project and the erosion depth near the head of the project, S "curve segment into a straight line segment, reducing the pear-type diversion dike near the mouth of the local scouring intensity. Provides a basis for the design, and for similar engineering design reference.