海底管道侧向屈曲激发设计应用及验证

Design,Application and Verification of Subsea Pipeline Lateral Buckling Initiator

介绍国内首次进行海底管道侧向屈曲激发的工程设计应用和基于投产后调查的验证及再分析。进行基于蒙特卡罗分析方法的侧向屈曲模式计算,并结合有限元分析,实现对可接受虚拟锚固间距的筛选,形成海底管道侧向屈曲控制基础。根据铺设后调查,对管道铺设后不直度、沉降值等数据进行分析,发现南海海底管道由孤立波造成的海床沉积物不均匀沉积的直接证据。投产后调查验证了侧向屈曲激发装置的有效性,并根据膨胀、侧向屈曲量进行再分析,验证管-土作用参数。结论对深水高温高压海底管道设计与建设以及管-土作用参数的计算有一定的指导意义。

The engineering design and application of lateral buckling initiator of subsea pipelines for the first time in China and the verification and re-analysis based on post-production investigation are introduced.The calculation of the lateral buckling based on the Monte Carlo analysis method is carried out,and combined with the finite element analysis,the screening of the acceptable virtual anchor spacing is realized,forming the basis for the lateral buckling control of subsea pipelines.Based on the post-laying investigation,the data such as the out of straightness and settlement value of the pipeline after laying are analyzed,and the direct evidence of uneven sediment deposition of the seabed sediment beside subsea pipeline caused by solitons in the South China sea is found.According to the post-production investigation,the effectiveness of the lateral buckling initiator device is verified,and the parameters of the pipe-soil interaction are verified according to the expansion and lateral buckling distance.The conclusions are of certain guiding significance for the design and construction of deep-water,high-temperature and high-pressure submarine pipelines and the calculation of pipe-soil parameters.