EP水电站溢洪道冲刷破坏机理及治理方案研究

Research on the mechanism and governance plan of erosion damage in the spillway of EP Hydropower Station

摘要

EP水电站溢洪道泄槽末段及鼻坎段左侧底板泄洪时被冲毁，对大坝运行安全造成威胁。水工模型试验及现场检查检测揭示溢洪道泄槽底板水毁的主要原因有：掺气坎位置设计不合理导致泄槽底板脉动压力大，掺气效果差；挑流鼻坎体型不合理，水流归槽不顺造成下游河道回流强度较大；溢洪道泄槽底板平整度差，止水失效，混凝土质量存在缺陷。为彻底消除溢洪道泄洪安全隐患，提出了优化掺气设施布置，鼻坎调整为大挑角差动鼻坎，拆除重建溢洪道泄槽底板等工程治理措施，原型观测试验表明治理效果较好，可为其他溢洪道水毁隐患治理提供参考。

Abstract

The bottom plate of the left side of the spillway groove and nose section of the EP hydropower station was washed away during flood discharge, posing a threat to the safety of the dam operation.The hydraulic model test and on-site inspection revealed that the main reasons for the water damage to the bottom plate of the spillway discharge channel are: The unreasonable design of the aeration bucket position leads to high pulsating pressure on the bottom plate of the discharge channel and poor aeration effect; The shape of the flip bucket is unreasonable, and the flow back to the channel is not smooth, [Results]ing in a greater intensity of backflow in the downstream river channel; The flatness of the bottom plate of the spillway channel is poor, the water stop is ineffective, and there are defects in the quality of the concrete. In order to completely eliminate the safety hazards of spillway discharge, engineering treatment measures such as optimizing the layout of aeration facilities, adjusting the nose bucket to a large angle differential nose bucket, and dismantling and rebuilding the bottom plate of the spillway discharge channel have been proposed. Prototype observation experiments have shown good treatment effects, which can provide reference for the treatment of other spillway water damage hazards.

关键词

EP水电站 / 溢洪道 / 冲刷破坏 / 掺气坎 / 挑流鼻坎

Key words

EP Hydropower Station / spillway / water erosion damage / aeration bucket / flip bucket

Author summay

黄 维(1970—), 男, 正高级工程师, 硕士, 主要从事水工结构设计、项目管理、大坝安全运行管理等工作。E-mail: [e-mail]