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

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.

Keywords

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