西南交通大学学报2025，Vol.60Issue(2)：513-523,11.DOI:10.3969/j.issn.0258-2724.20230712
复杂海况下跨海桥梁钢沉井基础下放过程及影响优化
Steel Caisson Lowering Process for Cross-Sea Bridges Under Complex Marine Conditions and Influence Optimization
摘要
Abstract
The positioning and lowering construction of large prefabricated steel caissons for cross-sea bridges is facing significant threats from the complex marine environment,including extreme waves and currents.In-depth research on the dynamic characteristics of the steel caisson during the positioning and lowering process under wave and current effects is of great importance for the positioning accuracy,lowering stability,and construction safety of steel caissons.Based on the LS-DYNA finite element program,a three-dimensional full-scale steel caisson fluid-structure coupling model under the action of wave and current was established.By comparing with the second-order Stokes wave analytical solution and the experimental results of the existing flume coupling experiment,the accuracy of the three-dimensional fluid-structure coupling model was verified.Subsequently,the validated model was used to investigate the influence of wave parameters,flow parameters,anchor cable arrangement,and structure lowering position on the wave and current loads and dynamic characteristics during the positioning and lowering process of the steel caisson.The research results indicate that the proposed anchor cable arrangement can effectively reduce the displacement and inclination of the steel caisson structure under different wave and current conditions,with a maximum inclination angle of no more than 2°.Compared with the individual effect of currents,the maximum horizontal force,horizontal displacement,and inclination angle of the steel caisson caused by the combined effect of waves and currents are increased by at least about 86.34%,25.15%,and 112.96%,respectively.As the submergence depth of the steel caisson increases,the maximum horizontal force and horizontal displacement experienced by the steel caisson increase by approximately 41.90%and 50.62%,respectively,while the maximum inclination angle of the steel caisson decreases by approximately 31.06%.In the study of the positioning and lowering process of the steel caisson,the influence of wave and current loads and displacements on the structure at different lowering depths should be fully considered,so as to provide a reliable theoretical basis for analyzing the stability of the steel caisson in the process of positioning and lowering.关键词
跨海桥梁/流固耦合/钢沉井/沉井下放/动力特性/数值模拟Key words
cross-sea bridge/fluid-structure coupling/steel caisson/caisson lowering/dynamic characteristic/numerical simulation分类
交通运输引用本文复制引用
陈明林,黄博,薛泽辰,周建庭..复杂海况下跨海桥梁钢沉井基础下放过程及影响优化[J].西南交通大学学报,2025,60(2):513-523,11.基金项目
国家自然科学基金项目(52478140) （52478140）
重庆市研究生科研创新项目(CYB240249) （CYB240249）
