地震作用下输水隧道的流-固耦合分析
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摘要
在大规模的调水工程的建设中穿越软土地区的浅埋输水隧道的抗震性能问题更加突出。大管径浅埋输水隧道由于内部水体质量巨大,且在振动作用下隧道内部水体产生晃动,由此引起水体-隧道衬砌之间的耦联作用,这些都直接影响隧道衬砌的动力响应。针对这一问题,将围岩-衬砌-水体作为一个整体进行有限元剖分,采用流-固耦合的分析方法,对隧道中流体对隧道衬砌的频率以及隧道衬砌动力响应的影响进行了研究,其中管内水体采用基于势的流体单元,同时对隧道内无水、半满水、满水的频率和隧道衬砌的动力响应进行了比较分析,结果表明流体对软土中输水隧道的频率和隧道衬砌动力响应的影响很大。
The aseismic performance of shallow buried water-conveyance tunnel in soft soil area is becoming more and more important with the development of large-scale water conveyance projects.In the big diameter water-conveyance tunnel,on account of large mass and sloshing of inner water under the vibration,which will bring water-tunnel lining interaction.All the above will affect dynamic response of tunnel lining.Aiming at this problem,the paper studies water-conveyance tunnel by dynamic fluid-structure coupling method.Especially,inner water is modeled by potential-based liquid element.The numerical results show that the inner water has great effects on the frequencies and dynamic response of water-conveyance tunnels.
The aseismic performance of shallow buried water-conveyance tunnel in soft soil area is becoming more and more important with the development of large-scale water conveyance projects.In the big diameter water-conveyance tunnel,on account of large mass and sloshing of inner water under the vibration,which will bring water-tunnel lining interaction.All the above will affect dynamic response of tunnel lining.Aiming at this problem,the paper studies water-conveyance tunnel by dynamic fluid-structure coupling method.Especially,inner water is modeled by potential-based liquid element.The numerical results show that the inner water has great effects on the frequencies and dynamic response of water-conveyance tunnels.
引文
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[2]Haroun M A.Vibration studies and tests of liquid storage tanks[J].Earthquake Engineering and Structural Dynamics,1983,(11):179-206.
[3]Geers T L.Doubly asymptotic approximations for transient motion of submerged structure[J].The Journal of the Acoustical Society of America,1978,64:1 500-1 508.
[4]钱江,翁致远,吕西林.座式快堆主容器与流体相互作用抗震性能分析[J].核动力工程,1998,(11):240-245.QIAN Jiang,WENG Zhi-yuan,LüXi-lin.Aseismatic characteristic analysis of bottom supported main vessel of fast breed reactors-fluid interaction[J].Nuclear Power Engineering,1998,(11):240-245.
[5]刑京堂,周盛,崔尔杰.流固耦合力学概述[J].力学进展,1997,27(1):19-30.XING Jing-tang,ZHOU Sheng,CUI Er-jie.A survey on the fluid-solid interaction mechanics[J].Advances in Mechanics,1997,27(1):19-30.
[6]Olson L G,Bathe.Analysis of fluid-structure interactions,A direct symmetric coupled formulation based on the fluid velocity potential[J].Computers and Structures.,1985,(21):21-32.
[7]陆鑫森,R W.克劳夫.流体-结构相互作用的杂交子结构法[J].振动与冲击,1982,(1):17-27.LU Xin-sen,Clough R W.Hybrid substructure approach for analysis of fluid-structure interaction in ship vibration[J].Journal of Vibration and Shock,1982(1):17-27.
[8]Zienkiewicz O C,Kelly D W,Bettess P.The coupling of the finite element method and boundary solution procedures[J].International Journal for Numerical Methods in Engineering,1977,11(2):355-375.
[9]吴一红,谢省宗.水工结构流固耦合动力特性分析[J].水力学报,1995,1(1):27-34.WU Yi-hong,XIE Sheng-zong.Dynamic characteristic analysis of interaction of fluid and hydraulic structures[J].Journal of Hydraulic Engineering,1995,1(1):27-34.
[10]张立翔.弱约束充液管道FSI频响分析[J].工程力学,1996,13(2):69-77.ZHANG Li-xiang,Tijsseling A S,Vardy A E.Frequency response analysis of FSI in liquid-filled pipelines[J].Engineering Mechanics,1996,13(2):69-77.
[11]张廷芳.计算流体力学[M].大连:大连理工大学出版社,1992.
[12]高峰,关宝树.沉管隧道三维地震反应分析[J].兰州铁道学院学报(自然科学版),2003,22(1):6-10.GAO Feng,GUAN Bao-shu.Three-dimensional seismic response analysis of immersed tunnel[J].Journal of Lanzhou Railway University(Natural Sciences),2003,22(1):6-10.
[13]陈韶章.沉管隧道设计与施工[M].北京:科学出版社,2002.
[14]于新杰,张鸿儒,王逢朝.南京长江沉管隧道竖井地震反应分析[J].北方交通大学学报,1999,23(4):61-64.YU Xin-jie,ZHANG Hong-ru,WANG Feng-chao.Seismic response analysis of shaft for Nanjing Changjiang immersed tube tunnel[J].Journal of Northern Jiaotong University,1999,23(4):61-64.
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