Gravity offshore platform,as an oil production platform that integrates drilling,production,storage and transportation facilities,has been widely used in offshore marginal oil field.Under the multiple marine loads,offshore platform is in the complex stress state.In order to meet the structural safety operation requirements,it is necessary to analyze the stress deformation of platform structure and foundation.Based on the LD 29-1 marginal oil field development project,combined with the platform design scheme suggested in"Shallow sea gravity platform underwater oil storage technology",numerical simulation calculations and centrifuge model tests were carried out.The deformation law,foundation soil displacement law,and failure mode of shallow sea gravity platform structure were determined.Results show that the overall structure of the platform has obvious lateral deformation under the action of marine load,the deck structure warped and the vertical settlement of surface foundation is large.When there is no bucket skirt on the platform,sliding deformation mainly occurs between the platform and the foundation,and when a 5 m long bucket skirt is added to the platform,the rotational deformation around the bottom plate mainly occurs between the platform and the foundation,while the upper platform structure has inclined.The results can provide technical reference for the construction and structural optimization of gravity offshore platforms.
关键词
重力式海洋平台/离心机模型试验/地基稳定性/数值模拟
Key words
gravity offshore platform/centrifuge model test/foundation stability/numerical simulation
维普
万方数据