深层隧道竖井流激振动响应分析  

Flow Induced Vibration Response Analysis of Deep Tunnel Shaft

作　　者：浦胜男 赵兰浩[1] 张海容 傅宗甫[1] PU Sheng-nan;ZHAO Lan-hao;ZHANG Hai-rong;FU Zong-fu(College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

机构地区：[1]河海大学水利水电学院

出　　处：《水电能源科学》2019年第8期69-72,共4页Water Resources and Power

基　　金：国家重点研发计划（2018YFC0407102）

摘　　要：针对某深隧工程中竖井结构因受水流脉动压力产生的流激振动响应问题,采用物理模型-数值计算联合方法构建竖井消能工三维有限元模型,通过对竖井消能工的流固耦合有限元计算,得出竖井消能工在不同流量工况下的自振特性,将试验测得脉动压力进行频谱分析得到优势频率,并与自振特性进行对比分析;采用随机振动法算出水流脉动压力作用下的动力响应,通过对比不同厚度的消能工台阶动力响应结果确定最优尺寸。结果表明,推荐方案竖井体型与水流发生共振的可能性不大,且振动量微小,因此从经济角度可考虑适当减小消能工台阶厚度。Aiming at the problem of flow-induced vibration of shaft structure caused by fluctuating pressure of water flow in a deep tunnel project, three-dimensional finite element model of shaft energy dissipator is established by using the joint method of physical model and numerical calculation. Through the fluid-solid coupling finite element calculation of shaft energy dissipator, the natural vibration characteristics of shaft energy dissipator are obtained under different flow conditions. The dominant frequency is obtained from the spectrum analysis of the fluctuating pressure measured by the test, and the results are compared with those of the natural vibration characteristics. The dynamic response of water flow under fluctuating pressure is calculated by random vibration method, and the optimal size is determined by comparing the dynamic response results of energy dissipator steps with different thickness. The results show that the resonance between shaft shape and water flow is not possible and the vibration quantity is small. So, the thickness of energy dissipation step can be properly reduced from the economic point of view.

关 键 词：深层隧道 竖井 脉动压力 流激振动响应 

分 类 号：TV653[水利工程—水利水电工程]