摘要
底流式泄洪闸在大流量泄洪时常伴随着闸墩剧烈振动。针对泄洪闸闸墩振动问题,以某水电站为例,基于水弹性物理模型试验和原型观测,提出改善闸墩结构和优化水库调度方案的两种减振措施。物理模型试验为研究闸墩振动提供了数据支撑,而原型观测结果验证了模型试验的可靠性。结果表明:当泄流量为5400 m^(3)/s时,通过优化水库调度,采用“低孔+表孔”联合泄洪的方式,表孔的泄流量从单独泄洪时的5400 m^(3)/s转变为联合泄洪时的低孔泄流量3481 m^(3)/s+表孔泄流量1919 m^(3)/s,表孔闸墩的振动位移标准差可从182.3μm减小到51.7μm,振动削减效果为71.6%;当表孔泄流量为10030 m^(3)/s时,通过对闸墩进行加固,闸墩的振动位移标准差可由288.8μm减小到129.6μm,振动削减效果为55.1%。
Underflow dissipation floodgates are subjected to severe pier vibrations during high-flow discharge.Addressing to this issue,the hydraulic elasticity model test and prototype observation of a hydropower station were conducted,with which two vibration reduction measures of improving pier structure and optimizing reservoir regulation schemes were proposed.The model test provided data support for the analysis of pier vibrations,while the prototype observation validated the reliability of the model test.When the discharge flow is 5400 m^(3)/s,the combined discharge approach of“low orifices and surface orifices”can reduce the flow through surface orifices from 5400 m^(3)/s in standalone discharge to 1919 m^(3)/s in combined discharge,and the rest 3481 m^(3)/s can discharge from the low orifices.In this case,the standard deviation of pier vibration displacement at surface orifices decreases from 182.3 to 51.7μm,achieving a vibration reduction effect of 71.6%.When the discharge from the surface orifices reaches 10030 m^(3)/s,reinforcing the piers can reduce the standard deviation of pier vibration displacement from 288.8 to 129.6μm,leading to a vibration reduction effect of 55.1%.
作者
刘昉
刘晴
李火坤
黄伟
柳波
唐义员
李玥康
王文韬
LIU Fang;LIU Qing;LI Huokun;HUANG Wei;LIU Bo;TANG Yiyuan;LI Yuekang;WANG Wentao(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2024年第2期107-114,共8页
Journal of Water Resources and Water Engineering
基金
江西省双千计划科技创新高端人才项目(jxsq2023201017)
江西省水利厅重大科技项目(202325ZDKT05)。
关键词
底流式泄洪闸
闸墩振动
减振措施
模型试验
原型观测
underflow dissipation floodgate
floodgate pier vibration
vibration reduction measure
model test
prototype observation
