水下生产系统防沉板结构形式改进研究  

Study of structural improvement of mudmat in the subsea system

作　　者：徐蒙[1] 杨树耕[1] 王晗[1] 刘晓峰[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《海洋通报》2016年第4期436-442,共7页Marine Science Bulletin

基　　金：国家重点基础研究发展计划(973)(2014CB046802)

摘　　要：防沉板是水下生产系统的重要基础形式,在海洋工程开发中有着广泛应用。基础承载能力不仅决定防沉板的适用范围,还关乎水下生产系统的稳定性与安全性。运用有限元软件ABAQUS,建立防沉板与土体的相互作用模型,通过平衡初始地应力,设置主从接触,施加重力荷载与位移约束,用Swipe法对不同结构形式防沉板进行数值模拟。比较分析多种防沉板在复合加载模式下的极限复合承载能力差异,讨论了单轴竖向承载力、V-H、H-M荷载空间破坏包络线。计算结果显示,防沉板是否有底部结构、底部结构的形式、布置以及深度对荷载位移曲线以及破坏包络线有着显著的影响。提出了通过改进防沉板结构形式以克服承载力不足的问题的建议,为拓宽防沉板的运用领域提供了参考。Mudmat is an important form of foundation used in the subsea system and has extensive application in the development of ocean engineering.Bearing capacity of foundation affects the range of mudmat application,and it also relates to the stability and safety of the subsea system.By using numerical simulation,the mudmat-soil interaction model is built with the finite element software ABAQUS.Through balancing the soil in-situ stress,setting the master-slave contact,applying the gravity load and displacement constraint,comparative analysis is carried out with method Swipe to find out the differences among the ultimate bearing capacity of different mudmats under the combined loading.Uniaxial vertical bearing capacity and failure envelopes of V-H and H-M load space are also discussed in this paper.The calculation outputs show that whether the bottom structure exists or not,the form,arrangement and depth of the mudmat bottom structure have the significant effect on load-displacement curves and failure envelopes.Finally,it is suggested that the problem of lacking of bearing capacity can be solved by the structural improvement,which can provide a reference to the application fields of the mudmat.

关 键 词：防沉板 水下生产系统 破坏包络线 极限承载力 

分 类 号：TE88[石油与天然气工程—油气储运工程]