Stability analysis on the positioning of steel caisson foundations during submerging stage under complex marine conditions

作     者：Chen, Minglin Xiao, Yong Jin, Yueming Sun, Yonggan Huang, Bo 

作者机构：Chongqing Jiaotong Univ Sch Civil Engn Chongqing 400074 Peoples R China Chongqing Jiaotong Univ State Key Lab Mt Bridge & Tunnel Engn Chongqing 400074 Peoples R China 

出 版 物：《OCEAN ENGINEERING》 (Ocean Eng.)

年 卷 期：2025年第321卷

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：Natural Science Foundation of Chongqing, China [CQYC20220101473, CSTB2023NSCQ-LZX0091] National Natural Science Foundation of China Research Innovation Program for Graduate Students in Chongqing [CYB240249] 

主　　题：Sea-crossing bridges Fluid-structure interaction Steel caisson foundation Caisson submerging Stability optimization Numerical simulation 

摘      要：The positioning and submerging stages in construction process of the large prefabricated steel caisson foundations for sea-crossing bridges will be seriously threatened by complex marine conditions, including extreme waves and currents. An in-depth analysis on the dynamic performance of steel caisson foundations during the positioning and submerging stages under extreme waves and currents is of great importance for the accuracy of positioning, stability of submerging, and construction safety of steel caisson foundations. A three-dimensional Fluid-Structure Interaction (FSI) model for a steel caisson foundation has been developed in this study by using LS-DYNA finite element program. The accuracy of the three-dimensional Fluid-Structure Interaction model was validated with second-order Stokes wave analytical solutions and the existing flume experimental results. Subsequently, the validated numerical model has been used to investigate the effects of different wave parameters, current velocities, anchor cable detailing, submerging positions, and wave-current incident directions on the wave-current loads and motion responses experienced by the steel caisson foundation during the positioning and submerging process. The results obtained indicate the following findings. (1) Compared with the consideration of the current velocities alone, the horizontal force and displacements (including X displacement and inclination) for steel caisson structure produced by the combined action of wave and current have been increased at least by 86.34 %, 25.15 %, and 112.96 %, respectively. (2) As the distance between the bottom of the steel caisson structure and the seabed decreases from 7 m to 3 m, the maximum horizontal force and X displacement for the steel caisson structure have been increased by approximately 41.90 % and 50.62 %, respectively, while the maximum inclination of the steel caisson structure decreases by about 31.06 %. (3) The varying wave and current incident directions i