深海夹层管复合结构非线性屈曲传播机理与止屈控制研究

项目名称： 深海夹层管复合结构非线性屈曲传播机理与止屈控制研究

项目编号： No.51479176

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 龚顺风

作者单位： 浙江大学

项目金额： 80万元

中文摘要： 低温高压环境决定深海油气管道需要具有较好的保温绝热性能。由内层输送钢管、外层保护钢管以及两管环形空间轻质保温绝热材料构成的夹层管，由于具有较高的承载能力和良好的保温绝热性能，近年来已应用于深海油气资源开发中。但深海高压环境容易诱发管道屈曲，并沿轴向传播，导致整条管道失稳破坏。而深海夹层管是一种复合结构，准确描述其屈曲传播特性并开展止屈控制具有较大的挑战性，迄今为止研究和规范鲜有涉及。本项目拟通过理论分析、深海压力缸比例模型试验和数值模拟相结合研究夹层管的非线性屈曲传播特性，旨在探索高静水压力作用夹层管复合结构屈曲传播与屈曲穿越止屈器的影响机理，揭示深海夹层管屈曲传播压力和变形形态、止屈器屈曲穿越压力和穿越模式与结构、材料特性和层间粘接性能之间的内在关系，建立深海夹层管屈曲传播压力和止屈器屈曲穿越压力的理论计算模型，形成止屈器止屈效率评估及设计理论，为深海夹层管的止屈控制奠定坚实的理论基础。

中文关键词： 深海；夹层管；复合结构；屈曲传播；止屈器

英文摘要： Due to low temperature and high hydrostatic pressure in deep waters, the oil-gas pipelines should have excellent thermal insulation properties. With high load-carrying capacity and good thermal insulation properties, sandwich pipes consisting of an inner and outer metallic pipe with a lightweight thermal insulation material in the annulus, have been used in deepwater oil-gas resource development in recent years. But high hydrostatic pressure in deep waters easily leads to local failure of pipe structures, the buckle may propagate along the pipeline at a high speed, collasping the whole pipeline. The sandwich pipe, being a composite structure, brings a great challenge to precisely decribe its buckle propagation characteristics and develop buckle arresting control techniques. So far there is little existing research and specification involved. In this project, the combined methods of theoretical model analysis, deep-sea pressure cylinder scale model experements and numerical simulations are applied to study non-linear buckle propagation characteristics of sandwich pipes. The present study aims to profoundly explore the influencing mechanisms of buckle propagation and buckle crossing arrestors for the composite structures of sandwich pipes under high external hydrostatic pressure, and systematically reveal the intrinsic relationships between buckle propagation pressure and deformed shape, buckle crossover pressure and mode for different types of buckle arrestors, and structure and material properties, as well as interlayer adhesion properties, and respectivley estabilsh therecial calculation models of buckle propagation pressure of deep-sea sandwich pipes and buckle crossover pressure of corresponding buckle arrestors, and finally bring forth arresting effeciency assessment and design theory of buckle arrestors. The research findings will offer a solid theoretical foundation for buckle arresting controls of deep-sea sandwich pipes.

英文关键词： deep sea;sandwich pipes;composite structures;buckle propagation;buckle arrestors