The Analysis About The Seepage Model Of Bucket Foundation Suction Penetration On Account Of Fluid-Structure Coupling Effect

In this paper, the seepage model during the process suction peretration of bucket foundation on accout of fluid-structure coupling effect is be analysed. As a new style of offshore platform foundation and a system of anchoring mooring buoys, the bucket foundation is paid attention for it's some peculiarities, for example, low weight,easy to install and perch,used repeatly etc.Because the history of its emergence and development is not too long, there are many technological problems in need of further research. Directing to the foundation form, this paper carrys on the reseach that dynamic seepage model during the process of suction penetration of bucket foundation on account of fluid-structure coupling effect, analyses the characteristics of the bucket foundation penetrated.First of all, directing to the structure form of the bucket foundation and the stress diversification of soil inside of the bucker, the penetration resistance formulas of the bucket foundation are researched, the stress equation is established by the principle of effective stress,Secondly, the new soil constitutive relationship is builded. The soil strain under the influence of the seepage force is divided into the soil grain elastic-plastic deform due to oneself induration and the soil body strain due to the deforme of soil framework. flow theory and the discrete element method are applied to the soil constitutive relationship model. Using the isotropy induration theory of flow theory, the constitutive relationship model of soil grain deform is builded; then, using the discrete element method, the constitutive relationship of soil framework is builded. So, the constitutive relationship of total deform during the process of seepage is received by combining two models.Thirdly, the dynamic physical parameter medels are taken into account during the process of the bucket foundation suction penetration that clear up the regret of taking no account of the physical parameters'dynamic change in the traditional calculation. The dynamic physical parameter medels of porosity and permeability during the process of the bucket foundation suction penetration are educed.Again, according to the instantaneous law of conservation of mass and the flow equation, the flow equation on account of the fluid-structure coupling adapting to the bucket foundation is builded. The stress equation and the flow equation are combined in the flow mathematic equation of the bucket foundation. Moreover, the certain solution conditions of above medels are offered.Lastly, using the educed medels, the example is analysed that test the madels'theorization, and receive the corresponding conclusions.The research achievement of this paper can make certain guidance and reference value combining with actual projects.