波浪力作用下开孔沉箱码头胸墙开裂原因分析

Analysis of breast wall cracking of open caisson wharf caused by wave force

针对开孔沉箱结构现浇混凝土胸墙开裂问题,采取理论分析、数值模拟、现场测试、原型观测、物理模型试验等手段,得出波浪力作用下开孔沉箱上部现浇混凝土胸墙开裂的原因。建立基于互联网+光纤传感技术的开孔沉箱顶板底部波压力在线监测系统,实时获取不同波浪要素下的顶板底部作用力及分布规律,采用物理模型试验测定开孔沉箱在波浪作用下顶板底部受力特征,验证现场监测数据的合理性,并提出工程优化措施的建议。结果表明,波浪力的作用是本工程胸墙开裂的根本原因,应加强早期的防浪工程措施,以减小波浪力的影响。

Aiming at the cracking problem of cast-in-situ concrete breast wall of open caisson structure,we apply the means of theoretical analysis,numerical simulation,field test,prototype observation and physical model test to obtain the cracking reason of cast-in-situ concrete breast wall of open caisson structure under wave force.We establish the on-line monitoring system for the bottom pressure of the caisson roof based on the internet and optical fiber sensing technology,obtain the force and distribution law of the roof under different wave elements in real time,measure the force characteristics of the roof of the open caisson under the waves by the physical model test,verify the rationality of the monitoring data,and propose the suggestions for engineering optimization measures.The results show that the action of wave force is the root cause of the crack of breast wall in this project,so the early engineering measures should be strengthened to reduce the influence of wave force.