Study On The Adsorption Capacity Of Submerged Structures In The Ocean

With the rapid development of China's space industry and ships,accidents of spaceflight devices and ship facilities falling into the sea frequently occur.In order to ensure the smooth flow of the water in the ocean or the reuse of the device,it is necessary to salvage the objects in the ocean.In the process of salvage,the size of lifting force should be determined first,especially the adsorption force.The adsorption between the submerged structure and the silt is the biggest obstacle in the lifting process,and then appropriate lifting measures and corresponding lifting equipment should be adopted to complete the operation.Adsorption force is a common force in ocean engineering,which is a kind of adsorption phenomenon in the process of the structure being pulled up from the seabed.Therefore,this paper mainly focuses on the gradual study of the adsorption force in the lifting process of the structure,and analyzes the composition and generation mechanism of the adsorption force.The mechanism of action between structure and soil in the process of subsidence and lifting was studied,and the effect of soil consolidation and pore water seepage on adsorption force was studied.Finally,the adsorption force is determined by combining theoretical study and finite element simulation.The main contents of this paper include:Firstly,the research status of lifting force and adsorption force of submarine structures at home and abroad is summarized systematically.Make clear the research content of this paper.Then,the composition of the lifting force and its influencing factors,especially the adsorption force,are analyzed in detail.The effects of the structure's immersion depth,bottom separation mode,time factor,tilt degree and the structure and substrate characteristics on the adsorption force were investigated.Next,the mechanism of action between structure and soil in the process of structure subsidence and lifting is analyzed.The constitutive model of soil is analyzed,and the plastic deformation and rheological deformation of soil are understood.Based on the analysis of the consolidation of soil when the object is settled,the differential equation of displacement and pore pressure representing elastomer and the continuity equation of pore water pressure and displacement representing elastomer are obtained.The seepage of pore water in the lifting process of a seated structure is analyzed.The action mechanism of soil on both sides when the structure is lifted in inclined state is analyzed.Finally,the finite element software ANSYS was used to simulate the lifting process of the latent structure,and the adsorption force was obtained.The influence of factors such as immersion depth and substrate parameters on adsorption capacity was discussed.