Taking the pipe segments of the Hongkong-Zhuhai-Macao Bridge immersed tube tunnel were regarded as the research object,a three-dimensional dynamic finite element model was established using MIDAS GTS NX software.Interface elements were used to simulate the joint of the pipe segments,and the dynamic response characteristics of the immersed pipe segments and high-pressure rotary jet grouting pile soft soil composite foundation were analyzed by applying heavy-duty vehicle simulation vibration loads.The research results indicate that vehicle vibration loads can induce significant environmental vibration effects on the pipe segments and composite foundations of underwater immersed tube tunnels.When a trailer of 120 level passes through an underwater immersed tube tunnel at a speed of 80 km/h,the maximum vertical displacement generated at the joint of the immersed pipe segments can reach 3.21 mm,and the maximum peak acceleration can reach 17.77 mm/s2;The maximum displacement of the top surface of the high-pressure rotary jet pile composite foundation can reach 1.98 mm,and the peak acceleration can reach 2.38 mm/s2.The acceleration vibration level at the joint of the immersed pipe segments can reach 81.9 dB.The influence of heavy-duty vehicle operation on the dynamic stability of submarine immersed tube tunnels on soft soil composite foundation cannot be ignored.
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