To investigate seismic response characteristics of immersed tunnels under different frequencies and input directions of earthquake ground motions, the underwater immersed tunnel of the Hong Kong-Zhuhai-Macao Bridge was taken as the research object. Firstly, based on the open-source numerical calculation platform OpenSees, a two-dimensional finite element model of the immersed tunnel-ground system was established. According to the site conditions of the tunnel, the physical and mechanical parameters of each soil layer and the input earthquake ground motions were determined. Secondly, based on the seismic safety evaluation results for the underwater immersed tunnel site of the Hong Kong-Zhuhai-Macao Bridge, the horizontal peak accelerations of the bedrock were determined for small, medium, and large earthquakes. Finally, the seismic response characteristic of underwater immersed tunnels under different frequencies and input directions of earthquake ground motion was explored. The computed results indicate that: (1) The bidirectional earthquake ground motions have the greatest impact on the response of tunnel structure for three types of different input directions of earthquake ground motion; (2) Earthquake ground motion with abundant low frequency component has a greater impact on the tunnel structure compared to earthquake ground motion with abundant high frequency component; (3) The vulnerable parts of the tunnel structure are mainly located at the connection between middle wall and top-bottom plates, haunches, top-bottom plates, and folded arch sections.
Huang Junchao
,
Su Lei
,
Meng Qingxu
,
Zheng Yewei
,
Chen Weiyun
. Seismic Response Analysis of Immersed Tunnels Subjected to Earthquake Ground Motions with Varied Frequencies and Input Directions[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 1025
-1033
.
DOI: 10.20174/j.JUSE.2025.S2.59
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