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钱江隧道位于钱塘河口,因其特殊地理位置面临涌潮冲击作用。涌潮产生动载,对河床形成冲击将引起隧道结构振动。目前对此振动影响评价尚不明晰,因而有必要进行深入研究涌潮作用下隧道结构动力响应,尤其是隧道纵向振动特性。依托钱江隧道工程,针对涌潮荷载作用下的钱江隧道进行了室内模型试验,用激振器产生的激振力模拟涌潮产生的动荷载,用加速度计测试隧道的动力响应。最后,通过与动力有限元程序计算结果进行对比,探讨了影响隧道动力响应的规律。
Qianjiang tunnel is located in Qiantang estuary, because of its special geographical location facing tidal impact. Tidal tide produce dynamic load, the impact on the riverbed will cause the tunnel structure vibration. At present, the evaluation of the influence of this vibration is not yet clear, so it is necessary to conduct an in-depth study of the dynamic response of the tunnel structure under the action of gushing waves, especially the longitudinal vibration of the tunnel. Relying on Qianjiang tunnel project, the tunnel model of Qianjiang tunnel under tidal load was tested by indoor model. Excitation force generated by exciter was used to simulate the dynamic load caused by tidal current. The dynamic response of tunnel was tested by accelerometer. Finally, by comparing with the calculation results of dynamic finite element program, the law that affects the dynamic response of tunnel is discussed.