多体耦合的长大弯曲型过江管道沉放系统施工过程数值分析及方案对比

Numerical and scheme comparison analysis for long-large-curved river-crossing pipeline immersion system with coupled multi-body in immersion construction

针对多体耦合的长大弯曲型过江管道沉放系统进行沉放施工时,过多的履带吊和驳船数量会大幅度增加施工难度、提高施工成本的问题,提出一种基于全耦合的时域分析方法,结合管道、Winch、6Dbuoy和Shape等理论,利用大型水动力分析软件OrcaFlex建立各沉放方案在沉放过程中的数值分析模型:首先利用现场实测结果与现场施工沉放方案的数值模拟结果进行对比,验证了本数值模拟方法的准确性;然后对现场施工沉放方案和两种优化方案进行方案比选,对比各方案在沉放过程中管道的动力响应、应力分布、锚索和吊缆张力,并进行各方案关键参数敏感性对比分析;最后提出了相应的施工建议。

The excessive numbers of crawler cranes and barges will greatly increase the construction difficulty and cost during the sinking construction.Based on the fully coupled time domain analysis method,Pipeline theory,and 6D buoytheory,etc.,the numerical analysis model(including the site construction model and two optimization models)of the pipeline immersion system was established via the large hydrodynamic analysis software OrcaFlex.The results of field measurement and numerical simulation were compared,and the comparison results were very well,all verifhing the accuracy of the numerical simulation method.The dynamic response and stress distribution of the pipeline,and the tension of the cables were investigated,and the sensitivity of key parameters was discussed.