溢洪道除险加固工程处理分析

Analysis on the Treatment of Danger Removal and Reinforcement Projects for Spillways

溢洪道是水工构筑物,有了溢洪道就可以有效避免大坝被洪水冲毁,是一种防洪设备,多数情况下溢洪道修建在水坝的一侧,就如一个比较大的水槽,当洪水期流量很大,使大坝的水位升高,超过防洪设计水位时,水就通过溢洪道向下游流出。溢洪道常见的问题有:进口左右边墙产生裂缝;进口引渠左右侧边墙产生倒塌;泥沙淤积严重;溢洪道宽度不足,左右岸山体风化;左右岸导流墙单薄,平面布置不符合规范要求;浆砌石溢流堰砌筑质量差,左右岸与山体相接处渗水;溢洪道下游无消能设施;水库泄洪量较大时下游回水极易冲刷坝脚,危及坝体安全等问题。基于此,该文以东洱河水库为例分析溢洪道除险加固。

The spillway is a hydraulic structure,with which the dam can be effectively prevented from being destroyed by the flood,and it is a kind of flood control equipment.In most cases,the spillway is built on the side of the dam,as if it were a relatively large water tank.When the flow is large during the flood period,raising the water level of the dam beyond the design water level of flood control,the water flows downstream through the spillway.The common problems of the spillway include that there are cracks on the left and right side walls of the inlet,the left and right side walls of the inlet approach channel collapse,sedimentation is serious,the width of the spillway is insufficient and the mountains on the left and right banks are weathered,the diversion walls on the left and right banks are thin and the plane layout does not meet the specification requirements,the masonry quality of the masonry overflow weir is poor and there is water seepage at the junction between the left and right banks and the mountain,there are no energy dissipation facilities at the downstream of the spillway,and that the downstream backwater is very easy to scour the dam toe and endanger the safety of the dam body when the flood discharge of the reservoir is large.Based on this,taking the Donger River reservoir as an example,this paper analyzes the danger removal and reinforcement of the spillway.