溢洪道出口段加固方案探究

当溢洪道出口段宣泄流量较小时,小洪水以贴壁流或跌水的形式下泄,将会对鼻坎底脚基础、两岸边墙基础产生淘刷,对鼻坎及边墙基础稳定造成不利影响。通过对某水库溢洪道现状分析,对挑流鼻坎起挑流量、渠底冲刷深度进行计算,探究适宜的工程措施。加固工程实施后能缓解溢洪道出口段两侧边墙基础冲刷问题,保证泄槽及挑流鼻坎的整体稳定安全。

Options for strengthening spillway outlet

When discharge flow at the outlet of spillway is relatively small, the discharge of small flood shall be clos- ing to wall or in a way of water falling, which may result in sediment flushing at foundation of nose ridge and side walls of banks that have negative impacts on their stability. Based on investigation of current situation of reservoir spillway, calculation of throw-flow of nose ridge and flushing depth of channel bottom is conducted for getting suitable structural measures. It is found that if structures are reinforced, it may release the flushing force at wall foundation of both sides of spillway outlet, so as to ensure stability and safety of spillway chute and throw-flow of nose ridge.