洋河水库溢洪道水工模型试验研究

A study for hydraulic model test of Yanghe Reservoir spillway

通过建立溢洪道整体水工模型,研究各泄流工况下的过流能力及挑流坎体型方案,并提出相应的改善措施。试验表明,校核洪水位下,溢洪道泄流能力试验值与设计值相比偏小1%左右;溢洪道出口挑流体型初始方案在小流量时,挑坎反弧段出现壅水现象,水流无法正常挑出;当挑坎挑角调整成10°,反弧半径增大到90m,渥奇段曲线适当抬升,水流可顺利挑出。通过优化挑坎体型结构,溢洪道在小流量过流时,水流挑距较初始方案增大5~10m,在溢洪道宣泄大流量时,水流挑距与初始方案相当,分布范围在坎下5~110m。溢洪道挑流坎体型优化方案,在水流起挑与下游冲刷两个方面,均优于初始体型方案,为工程设计提供了安全可靠的技术支持。

The overflow capacity and the shape scheme of flip bucket on each discharge condition are studied,based on the establishment of the overall hydraulic model of spillway,and the corresponding improvement measures are put forward.The test results show that under the maximum flood level,the test value of spillway discharge capacity is about 1%smaller than the design value.In the initial design of spillway outlet flip bucket shape,when the flow is small,backwater phenomenon of the flip bucket reverse arc section appears,and the flow cannot be carried out normally.When the flip angle of flip bucket is adjusted to 10°,the radius of reverse arc is increased to 90m,and the Ogee section is raised properly,the flow can be picked out smoothly.When the discharge is small,the flip distance of the spillway increases by 5~10m compared with the initial design by optimizing the structure of flip bucket,and when the discharge is large,the flip distance of the spillway is equivalent to the initial scheme,the distribution range is 5~110m below the bucket.The shape optimization scheme of spillway flip bucket is superior to the initial shape scheme in the aspects of water lifting and downstream scour.The model test provides safe and reliable technical support for engineering design.