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复杂海况下跨海桥梁钢沉井基础下放过程及影响优化

陈明林 黄博 薛泽辰 周建庭

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. doi: 10.3969/j.issn.0258-2724.20230712
引用本文: 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. doi: 10.3969/j.issn.0258-2724.20230712
CHEN Mingling, HUANG Bo, XUE Zechen, Zhou Jianting. Research and Optimization of Steel Caisson Positioning and Lowering Process for Cross-Sea Bridges under Complex Marine Conditions[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230712
Citation: CHEN Mingling, HUANG Bo, XUE Zechen, Zhou Jianting. Research and Optimization of Steel Caisson Positioning and Lowering Process for Cross-Sea Bridges under Complex Marine Conditions[J]. Journal of Southwest Jiaotong University. 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

doi: 10.3969/j.issn.0258-2724.20230712
基金项目: 国家自然科学基金项目(52478140);重庆市研究生科研创新项目(CYB240249)
详细信息
    作者简介:

    陈明林(1999—),男,博士研究生,研究方向为跨海桥梁波浪动力学,E-mail:minglinchen@mails.cqjtu.edu.cn

    通讯作者:

    黄博(1992—),男,副教授,博士,研究方向为跨海桥梁动力学及流固耦合,E-mail:bohuang@cqjtu.edu.cn

Research and Optimization of Steel Caisson Positioning and Lowering Process for Cross-Sea Bridges under Complex Marine Conditions

  • 摘要:

    跨海桥梁大型预制钢沉井的定位下放施工面临着海洋复杂环境中极端波浪和水流的巨大威胁,深入研究波流作用下钢沉井定位下放过程中的动力特性对钢沉井的定位准确性、下放稳定性及施工安全性具有重要意义. 基于LS-DYNA有限元程序构建波流作用下三维全尺寸钢沉井流固耦合模型,通过与Stokes二阶波浪解析解和已有水槽耦合实验结果进行对比,验证该三维流固耦合模型的准确性;使用已验证模型探究波浪参数、水流参数、锚缆布置形式以及结构下放位置等对钢沉井定位下放过程中所受的波流荷载和动力特性影响规律. 研究结果表明:所提出的锚缆布置形式可以有效降低钢沉井结构在不同波流作用下的位移和倾角,其最大倾角不超过2°;相较于水流单独作用,波流共同作用对钢沉井造成的最大水平力、水平位移和倾角至少分别增加了约86.34%、25.15%和112.96%;随着钢沉井淹没深度的增加,钢沉井所受最大水平力和水平位移分别增大了约41.90%和50.62%,钢沉井的最大倾角却减小了约31.06%;在钢沉井定位下放研究中,应充分考虑结构在不同下放深度时所受的波流荷载和位移等的影响,为分析钢沉井下放过程中的稳定性提供可靠的理论基础.

     

  • 图 1  耦合模型示意(单位:米)

    Figure 1.  Schematic diagram of coupling model (unit: m)

    图 2  钢沉井示意

    Figure 2.  Schematic diagram of steel caisson

    图 3  波浪面时程对比

    Figure 3.  Comparison of the time history of wave profile

    图 4  结构波浪力时程对比

    Figure 4.  Comparison of the time histories of wave forces on structure

    图 5  结构位移时程对比

    Figure 5.  Comparison of the time histories of structural displacement

    图 6  锚缆布置形式示意

    Figure 6.  Schematic diagram of anchor cable arrangement

    图 7  不同锚缆布置形式下结构位移对比

    Figure 7.  Comparison of peak displacements of the structure with different anchor cable arrangements

    图 8  钢沉井触底示意(V=5 m/s)

    Figure 8.  Schematic diagram of a steel caisson in contact with the seabed (V=5 m/s)

    图 9  钢沉井受力时程对比

    Figure 9.  Comparison of the time histories of forces on steel caisson

    图 10  钢沉井位移时程对比

    Figure 10.  Comparison of the time histories of displacements on steel caisson

    图 11  不同工况下钢沉井所受水平力和位移峰值对比

    Figure 11.  Comparison of peak horizontal force and displacement of steel caisson under different conditions

    图 12  不同下放深度钢沉井所受水平力和位移峰值对比

    Figure 12.  Comparison of peak horizontal force and displacement of steel caisson under different lowering depths

    图 13  不同下放深度钢沉井应力图

    Figure 13.  Stress diagrams for steel caissons with different lowering depths

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出版历程
  • 收稿日期:  2023-12-27
  • 修回日期:  2024-05-23
  • 网络出版日期:  2024-11-01

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