考虑行波效应的沉管隧道抗震性能:振动台阵试验研究

摘要

Shaking table tests were conducted to investigate the aseismic behavior and dynamic response features of an immersed tunnel model and its joints.In order to contrastively study influences of wave passage effect on soil,immersed tunnel and its joints,the uniform longitudinal seismic excitation and the longitudinal seismic excitation with wave passage effect at different apparent wave velocities were considered in tests.The results showed that under the uniform longitudinal seismic excitation,the tunnel and soil body keep a synchronous motion;when the wave passage effectis considered,the tunnel and soil body have a relative sliding;the longitudinal wave passage effect and its input direction have a larger influence on axial force,bending moment and deformation of joints;the wave passage effect makes joints' responses tend to non-uniform distribution,so the wave passage effect should be considered in aseismic design of an immersed tunnel and its joints.%为研究沉管隧道结构及接头的抗震性能,通过振动台阵试验研究了沉管隧道结构及其接头动力响应特征.试验分别考虑了一致及不同视波速的纵向行波激励,对比研究了行波效应对土和沉管隧道及其接头的影响规律和影响程度.试验结果表明:一致激励下,隧道与土体具有比较一致的整体运动,而考虑纵向行波效应时,土体和隧道产生相对滑移,同时纵向行波效应及其输入方向对接头轴力、弯矩和变形有较大影响,行波效应使得沉管隧道接头的反应趋于不均匀,沉管隧道及其接头进行抗震设计时应考虑行波激励的影响.