非粘结型柔性管道抗压溃分析与实验验证

发布时间：2018-02-21 08:50

本文关键词： 非粘结型柔性管道径向压缩刚度压溃有限元实验验证　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着能源需求的日益增长及陆地资源开采接近尾声,对海洋油气资源的开采成为目前国际能源的热点。非粘结型柔性管道作为能源开采中的重要输运装备,对其设计及制造技术的研究尤为重要。非粘结型柔性管道由金属铠装层及聚合物材料功能层非粘结而成,层间可相互滑动。管道铺设、储运过程中会出现径向压缩失效进而导致压溃失效,而深海应用会出现压溃失效,因此要对非粘结型柔性管道进行抗压溃分析。本文首先调研并总结非粘结型柔性管道结构形式及其功能和国内外学者关于管道抗压溃分析的研究现状。基于有限元数值方法,建立骨架层三维有限元模型,研究径向压缩载荷作用下骨架层的力学行为。同时将骨架层简化为圆环,推导了圆环对径压缩刚度的解析公式。搭建了柔性软管径向压缩性能的实验测试装置,通过骨架层试件的径向压缩测试,验证了有限元模型的正确性。数值研究还发现,随着钢带厚度与内径比的增加,骨架层径向压缩刚度会显著增大。该有限元数值模型及其分析技术为柔性管道受径向压缩分析和设计提供了有效的技术手段。对多层结构抗压溃设计进行研究,通过简化的数值模型研究湿压溃及干压溃两种情形,得出抗压铠装层对骨架层抗压溃性能影响很大,同时抗压铠装层与内护套层之间间隙的大小对管道抗压溃性能也有影响,而无限提高抗压铠装层厚度不能提高结构抗压溃性能,反而增加了载荷负担及成本。针对浅水水域提供简化的非粘结型管道设计,即浅水经济型管道,此种管道形式不仅能满足功能需求同时节约了成本。对一种浅水经济型管道进行数值与实验分析其抗压溃性能,得出能满足水深要求,同时验证了前述多层结构设计及截面等效方法的合理性。
[Abstract]:With the increasing energy demand and the end of land resource exploitation, the exploitation of offshore oil and gas resources has become a hot spot in the world. It is particularly important to study the design and manufacture technology. The non-adhesive flexible pipeline is composed of metal sheathed layer and functional layer of polymer material, which can slide each other. During storage and transportation, radial compression failure will occur, which will lead to crushing failure, while deep-sea application will cause crushing failure. Therefore, it is necessary to analyze the failure resistance of the non-bonded flexible pipeline. Firstly, this paper investigates and summarizes the structure form and function of the non-bonded flexible pipeline and the present situation of the domestic and foreign scholars' research on the anti-collapse analysis of the pipeline, based on the finite element numerical method. A three-dimensional finite element model of the skeleton layer is established to study the mechanical behavior of the skeleton layer under radial compression load. At the same time, the skeleton layer is simplified as a circular ring. The analytical formula of radial compression stiffness of circular ring is derived. An experimental test device for the radial compression performance of flexible hose is built. The validity of the finite element model is verified by the radial compression test of the skeleton specimen. The numerical results also show that the finite element model is correct. With the increase of the ratio of strip thickness to inner diameter, The radial compression stiffness of the skeleton layer will increase significantly. The finite element numerical model and its analysis technology provide an effective technical means for the radial compression analysis and design of flexible pipeline. The simplified numerical model is used to study the wet crushing and the dry crushing. It is concluded that the compressive armor has a great influence on the crushing performance of the skeleton layer, and the gap between the compressive armor and the inner sheath has an effect on the crushing resistance of the pipeline. However, unlimited increase in the thickness of the sheathed layer does not improve the crushing resistance of the structure, but rather increases the load burden and cost. In the case of shallow water, a simplified design of non-cohesive pipeline, that is, shallow water economical pipeline, is provided. This kind of pipeline can not only meet the function requirement but also save the cost. Through numerical and experimental analysis of the crashing resistance of a shallow water economic pipeline, it is concluded that it can meet the requirement of water depth. At the same time, the rationality of the design and section equivalent method is verified.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P756.2

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