海底嵌入式管道的管土相互作用机制与屈曲失稳理论

随着海洋油气资源的开发，海底管道的稳定与安全已成为海洋工程研究的重点之一。本项目着力研究海底浅层软土性状，试验建立考虑小围压条件下Ko固结软土的率相关本构关系。运用大变形有限元技术和室内模型试验研究，提出嵌入式海管屈曲过程中管土单元相互作用物理机制和分析模式。综合考虑管道的初始构形和初始缺陷，分析长距离海底管道的整体梁柱型屈曲机制，揭示坐底海床软土对海底管道壳型褶皱屈曲发生、发展的影响规律。研究提出深海管道整体梁柱型屈曲和壳型褶皱设计控制理论，提升蛇形铺设和管垫等屈曲控制技术，并建立其安全评价体系，为深海海底管道工程安全提供技术保障。

With the development of the offshore oil and gas，the stability design of underwater pipelines become one of the key factors for the offshore engineering.This project is going to study the behavior of surface soil in deepwater, then considering.rate-dependent constitutive model of Ko consolidated soil, we will build the modelof pipe-soil interaction through nolinear FEM. Combined with the consideration of initial imperfection of underwater pipelines and the model of pipe-soil inteaction, the study of global buckling and wrinkling of pipelines will be carried out in this project. We will develop the theory and design of global buckling and wrinkling of underwater pipelines through experiment study and numeriacal simulation, and enhance the controling measures of pipeline buckling such as snake pipe laying and pipe cushion technique. Finally we will build our safety evaluation system for the buckling and wrinkling of underwater pipelines.