坍塌防波堤修复施工中的结构稳定性分析及优化—江苏LNG防波堤工程实践

Structural Stability Analysis and Optimization of the Repairing Construction of Collapsed Breakwater-The Practice of Jiangsu LNG Breakwater

摘要

针对江苏LNG项目防波堤S2+300-S2+400段坍塌后的结构稳定性修复需求开展处理，依托现场勘查与监测数据，分析坍塌机理、做稳定性评估、优化修复方案。依靠无人机航拍、水下声纳扫测查明坍塌范围和特征，靠有限元法搭建防波堤结构稳定性分析模型，找出结构失稳关键诱因；依托扭王字块护面修复工艺，调整块体布置方案和施工参数。项目实操案例显示，优化后的修复方案让防波堤整体抗滑移安全系数从1.18升到1.52，把抗倾覆安全系数从1.25提至1.63，结构沉降量不超过5mm，符合《防波堤与护岸设计规范》（JTS154-2018）规定。该研究可为同类坍塌防波堤修复工程的结构稳定性控制提供科学依据与技术支撑。

Abstract

In response to the structural stability repair needs after the collapse of the S2+300-S2+400 section of the Jiangsu LNG project breakwater, this study analyzes the collapse mechanism, conducts stability assessment, and optimizes the repair plan based on on-site investigation and monitoring data. Relying on drone aerial photography and underwater sonar scanning to identify the collapse range and characteristics, using finite element method to build a stability analysis model for the breakwater structure, and identifying the key causes of structural instability; Adjust the block layout plan and construction parameters based on the technique of repairing the twisted crown block protective surface. The practical case of the project shows that the optimized repair plan has increased the overall anti slip safety factor of the breakwater from 1.18 to 1.52, and the anti overturning safety factor from 1.25 to 1.63. The structural settlement does not exceed 5mm, which complies with the provisions of the “Design Code for Breakwaters and Banks” (JTS154-2018). This study can provide scientific basis and technical support for the structural stability control of similar collapsed breakwater repair projects.

关键词

防波堤修复 / 结构稳定性 / 有限元分析 / 扭王字块 / 优化方案

Key words

breakwater repair / structural stability / finite element analysis / twisted king block / optimization plan

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