深水管道抗压承载力海上试验设想与分析

Envisage and analysis of sea trial on deep-water pipeline's resistance to external pressure

截至目前,国内外少有成功开展深水管道抗压承载力海上试验的案例,而海上试验对于验证室内压力舱模拟试验结果可靠性是非常必要的。对深水管道屈曲压溃及屈曲传播海上试验进行了设想和分析,并设计了试验流程。考虑到室内压力舱的加载特性,屈曲传播试验会受到若干因素影响,结合数值模拟,考虑屈曲传播海上试验中可能出现的各种加载条件对管道屈曲传播压力的影响进行了研究。数值模拟的结果与室内压力舱试验的结果之间存在一定差异,对该现象存在的原因进行了分析。还对试验中可能存在的问题及需要注意的关键难点提出了解决方案。

There are few successful cases of sea trial on deep-water pipeline’s resistance to external pressure until now.However,it is significantly important to verify the reliability of the results obtained by indoor full-scale hyperbaric chamber.Sea trial on collapse and buckling propagation of deep-water pipeline is envisaged and analyzed,as the test scheme is designed.With consideration of the loading identity of indoor chamber,the test on buckling propagation could be affected by several factors.The influences caused by variable loading conditions on the buckling propagation pressure of pipeline are studied by using finite element method.There are some differences between the conclusions drawn by the numerical simulation and the test implemented in full-scale hyperbaric chamber,the reasons of which are analyzed.Some possible problems which could happen in sea trial are considered,and solutions to key difficulties are proposed.