三江口水利枢纽工程泄洪消能试验研究

Experimental study on flood energy dissipation for Sanjiangkou water control project

三江口水利枢纽大坝为混凝土薄拱坝,最大泄量为7534 m3/s,泄洪消能问题十分突出。通过1:80的水工整体模型试验对泄洪表孔的布置进行了深入的试验研究,不仅较好地解决了泄洪消能问题、简化了结构布置,并节省了工程量,而且在鼻坎末端采用了偏流扩散装置,改善了流态,也改善了冲坑形态,比蔺汉口坝顶表孔的布置又前进了一步。

The Sanjiangkou water control project consists of a thin concrete arch dam with a maximum discharge capacity of 7534 m3/s and its flood energy dissipation poses a prominent problem. The experimental study carried out on a 1: 80 scale solid hydraulic model in respect of arrangement of the surface flood outlets has not only addressed the problem of flood energy dissipation and simplified the structural arrangement and reduced construction quantities as well. The bias diffuser provided at the end of bucket improved the flow regime and the shape of scouring hole. It is a further step comparing the surface spillway arrangement for the Ninghekou dam.