黄土软基上溢洪道体型优化试验研究

黄土软基上的宽浅式溢洪道宽深比大,水流动量分散,受边界的影响敏感,稳定性差.针对西段村水库宽浅式非常溢洪道水流流态不稳定、消能不充分等问题,通过整体水工模型研究,分析了问题产生的主要原因,经优化体型,适当缩窄溢洪道陡槽宽度,减少水流宽深比,改善过渡段水流边界条件等,实现了陡槽水流的稳定性与溢洪道下游的充分消能,同时节约了引渠以下混凝土工程量的1/3.

Optimal Experiment Study on Shallow Spillway on Soft Foundation of Loess

If the form ratio of wide and shallow spillway built on soft foundation of loess is large,its flow momentum becomes more dispersive,more sensitive to the boundary and less stableAccording to the unstable flow and insufficient energy dissipation of the wide and shallow spillway of Xiduancun reservoir,the main reason is analyzed through test observation and research with the aid of monolithic hydraulic modelAfter improving test,optimizing the shape of model,reducing the width of chute of spillway and the form ratio of flow,improving boundary condition of the transition section flow and so on,the flow in the chute becomes more stable,the effect of energy dissipation of flow in lower course of the spillway is better,and one third quantity of concrete of the approach channel on down is saved