Abstract: To investigate the acceleration characteristics of the submerged floating tunnels(SFTs) under the action of wave load, a model test of the free elliptical section at both ends with a scale of 1:60 is conducted. First, the acceleration response of key points of the elliptical section under wave load is analyzed using the model test. Next, the influence of wave period and height on the timehistory variation, frequency domain, and extreme values of longitudinal, transverse, and vertical acceleration of SFT are discussed. The results are summarized as follows: (1) The timehistory of the longitudinal, transverse, and vertical acceleration of the tube increases with increasing wave height, and the maximum value of longitudinal acceleration fluctuates greatly. (2) The timehistory of transverse acceleration changes from high frequency to low frequency, and the acceleration peaks show an obvious nonlinear growth trend. (3) The vertical acceleration exhibits a multiple and periodic variation. The timehistory of acceleration displays a highfrequency and multipeak in a small period, and its peak value increases initially, followed by a decrease with increasing wave period.

Key words: submerged floating tunnel, wave load, acceleration, model test