Abstract:The steel cylinder structure avoids foundation excavation and does not require stone throwing,allowing for rapid island formation.Compared with traditional hydraulic structures,it has obvious advantages and broad application prospects.With the advancement of engineering towards the open sea,the insertion ratio has become an important factor affecting the stability of steel cylinder structures.The existing specifications and calculation methods gradually do not meet the needs of engineering,so it is urgent to conduct in-depth research on this issue.We study the influence of insertion ratio on the stability of steel cylinder structures through centrifugal model test.The results show that the horizontal displacement of the cylinder top increases with the increase of wave load.In the initial stage,it approximately increases linearly,and after reaching the ultimate load,the horizontal displacement of the cylinder top increases sharply,and the curve shows a steep decrease.The instability and failure of steel cylinders are mainly manifested as overturning failure,during the failure,circular cracks appear on the mud surface on the sea side and radial cracks appear on the mud surface on the land side.Both the ultimate load of the steel cylinder and the load when the ratio of the horizontal displacement at the top of the cylinder to the height of the cylinder body above the mud surface S/H is 1.5% increase with the increase of the insertion ratio,showing an approximately linear relationship.The relationship between the ultimate load and insertion ratio of a steel cylinder can be approximately expressed as y=19 427x+6 268.3,and when S/H is 1.5%,the relationship between the load and insertion ratio can be approximately expressed as y=2 072.6x+6 100.7.
