地震作用下输水隧道的流-固耦合分析

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.

Fluid-structure coupling analysis of water-conveyance tunnel subjected to seismic excitation

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.