土坝溢洪道底流消能计算成果分析

Analysis of Calculation Results of Bottom Flow Energy Dissipation in Earth Dam Spillway

分析佛山市某水库2019年和2020年2次溢洪道底流消能计算过程及计算成果,采用溢洪道设计规范和水力计算手册2种方法,对同一工程的消能防冲进行复核,其计算结果存在的差异及原因。为降低中小型水库除险加固工程的经济成本,结合该水库溢洪道现状,提出计算消能工的跃前水头应采用考虑泄流沿程水头损失的能量方程分段求和法,该方法更贴合实际工况,在保证安全的前提下可以降低工程实施成本。

This paper analyzes the calculation process and results of the bottom flow energy dissipation of a certain reservoir of Foshan in 2019 and 2020.It adopts two methods,namely spillway design specifications and hydraulic calculation manuals,to review the energy dissipation and erosion prevention of the same project,and to identify the differences and reasons in the calculation results.In order to reduce the economic cost of the reinforcement project for small and medium-sized reservoirs,combined with the current situation of the spillway of the reservoir,it is proposed that the calculation of the pre jump head of the energy dissipator should adopt the segmented sum method of the energy equation considering the head loss along the discharge path.This method is more suitable for actual working conditions and can reduce project implementation costs while ensuring safety.