长沙综合枢纽三期施工导流及通航模型试验研究

Model test study on construction diversion and navigation condition in 3rd period of Changsha comprehensive junction

针对三期施工导流期的特点,采用正态1:100整体物理模型,对该河段的行洪能力和通航水流条件进行试验研究。通过分析设计方案河段上游水位雍高值、围堰附近的流场特点和各泄水闸闸前行进流速,从增加溢流宽度和调整纵向围堰与水流方向两方面对其进行优化,共提出了3种优化方案。根据三期导流的特点并对比不同施工导流方案下的上游水位雍高值,得到有利于河段行洪及施工布置的推荐方案。最终通过流场分析表明,推荐方案的水流条件满足船舶安全通航要求。

According to the characteristics of the third phase of construction diversion, the river flood capacity and navigation flow conditions were studied by integrated physical model with the scale of 1：100. By analyzing the rising value of upstream water level, the flow field characteristics near the cofferdam and the flow velocity, three kinds of optimized schemes were proposed to increase the overflow width and adjust the direction of longitudinal cofferdam and water flow. Based on the characteristics of the third phase of construction diversion and the comparison of rising value of upstream water level between different construction diversion schemes, the recommended proposal which was conducive to the river flood and construction layout was obtained. Finally, the flow field analysis shows that the flow condition of the recommended proposal meets the requirements of navlgahon safety.