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由于生产工艺的要求,开采的原油经常需要在一定的温度和压力下才能顺利输送,而输油过程中的高温和高压会导致海底管线中产生较大的附加应力。管线受到地基土的约束作用后无法自由变形,附加应力的不断累积,造成管线发生整体屈曲变形,埋地的海底管线通常会产生竖直向的整体屈曲变形而影响使用甚至破坏。基于点支撑初始缺陷形式的海底管线,给出了管线竖直向整体屈曲分析的解析解,结合实际工程中铺设的高温高压输油管线进行了整体屈曲分析,揭示了不同温度条件下埋地管线发生竖直向整体屈曲的规律性,提出挖沟掩埋可以有效地防止管线发生温度应力下的整体屈曲。
Due to the requirements of the production process, the crude oil extracted often needs to be transported smoothly under a certain temperature and pressure, and the high temperature and pressure during the oil-sending process can cause large additional stress in the subsea pipeline. After being restrained by the foundation soil, the pipeline can not be deformed freely and the additional stress continuously accumulates, resulting in overall buckling deformation of the pipeline. The buried pipeline usually produces vertical buckling deformation and affects the use or even destruction. Based on the analysis of submarine pipelines with initial defects in point support, an analytical solution to the buckling analysis of pipelines in vertical direction is given. According to the buckling analysis of HTHP pipelines laid in practical engineering, the buried pipelines under different temperature conditions are revealed Vertical buckling of the regularity of the whole, proposed trenching can effectively prevent the pipe under the temperature stress of the overall buckling.