摘要
考虑粘-弹性人工边界、土壤的非线性及流-固耦合作用,建立了沉管隧道-土壤-流体(水)相互作用的力学模型,采用Newmark算法,对沉管隧道在地震激励下的响应进行分析.分析了不同地震激励以及不同水深条件下沉管隧道结构的应力变化,研究了动水压力对沉管隧道的影响.结果表明:在只考虑水平方向地震激励时,动水压力对沉管隧道的作用影响较小,在分析时可以忽略动水压力的作用;在含有竖直分量的地震激励下,动水压力对沉管隧道的应力有较大影响,在分析沉管隧道的地震响应时,应该考虑竖向地震的作用;由于动水压力的作用,沉管隧道的最大应力位置会发生变化.结果可用于运行条件下沉管隧道的动力特性以及损伤产生发展机理的研究.
This paper presented an analytical model of tunnel-soil-fluid interaction taking account of nonlin ear material behavior of soil, viscous-spring artificial boundary and solid fluid interaction. Seismic respon ses of the immersed tunnel were calculated using Newmark method. The comparative analysis of stress values was completed under different types of earthquake excitation, as well as different depths of the water, thus the influence of hydrodynamic pressure on the structure was studied. It is shown that under horizon tal earthquake excitation the influence of hydrodynamic pressure on the immersed tunnel can be omitted; the water plays an important role in the vertical seismic response, therefore, the vertical seismic action should be considered in dynamic analysis of structure stress in immersed tunnel; the distribution of extreme stress in immersed tunnel may change when hydrodynamic pressures are considered. The conclusion can be useful in dynamic analysis of immersed tunnel and structural health monitoring.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2008年第6期1027-1031,共5页
Journal of Shanghai Jiaotong University
基金
教育部科技创新工程重大项目培育资金项目
关键词
沉管隧道
动水压力
粘-弹性人工边界
流-固耦合
immersed tunnel
hydrodynamic pressure
viscous-spring artificial boundary
solid-fluid interaction
