拦河闸下游两级消力池布置和计算研究

Study on calculation and layout of two stage stilling pool at downstream of sluice

通常根据拦河闸泄洪水力条件、闸址地形和地质条件、两岸翼墙和堤围的安全、工程施工和投资等,拦河闸下游可选择设置一级或两级消力池。本文对拦河闸下游两级消力池的布置和水力计算方法进行了分析,提出了相应的布置和计算方法:1首先确定一级消力池水平段池底高程,计算消力池末端尾坎的合理高度和水平段池长,使一级消力池内形成稳定的水跃;2根据拦河闸闸址下游河道水位条件,在满足二级消力池出流与下游河道水流为缓流衔接的条件下,初拟二级消力池末端尾坎顶高程,计算出消力池池深和池长,使消力池出流平顺与下游河道水流衔接。本文成果得到了水力模型试验研究实例的验证,可供类似工程设计参考。

Based on the conditions of flood-releasing hydraulic ,topograph and geology , wing walls of two bank and embankment safety , construction and investment etc .,one or two stages of stilling basin can be chosen in the downstream of barrage .The paper analyzed the layout and hydraulic calculation method of two stages stilling basin in downstream of sluice that are first , determining the horizontal bottom's eleva-tion of primary stilling basin , and then calculating the reasonable height of stilling basin end sill and hor-izontal section length which can form stable hydraulic jump in stilling basin;secondly , according to the river water level conditions at the downstream of sluice , and meeting two stages stilling basin flow joint with the downstream river flow in subcritical flow conditions , protocoling preliminarily the top elevation of the second stage stilling ,and then calculating the depth and length of stilling basin .which make stilling basin out flow joint smoothly with downstream river flow .The results verified by hydraulic model test of the examples can provide a reference for similar engineering design .