The single-column composite bucket foundation,as a new type of offshore wind turbine foundation structure,has been widely used in China's offshore wind power installation surge.In order to investigate the settlement characteristics of the single-column composite bucket foundation in sandy soil,small-scale physical model tests were conducted indoors.During the experiments,the method of suction negative pressure sinking was employed,with the total weight of the structure selected as the main variable.The sinking time history curve of the structure was obtained,showing that as the structure weight increases,the total time required for sinking decreases,with the self-weight sinking stage proportion increasing.The variation law of the structure inclination angle during the sinking process was summarized.The inclination angle is relatively large at the moment of soil entry,and the inclination situation of the structure during the self-weight sinking stage is affected by the uniformity of the soil,showing a relatively complex pattern that is difficult to recover the inclination angle only by adjusting the suction valve,but with a noticeable effect of negative pressure leveling.The variation law of the pore water pressure inside the chamber during the sinking process was determined,showing a gradual decrease in pore water pressure inside the chamber as the sinking progresses,with relatively minor disturbances to the soil during the self-weight sinking stage.The resistance reduction effect of sinking seepage in sandy soil is very obvious,with the seepage flowing from the outside of the chamber along the bottom of the tube towards the inside.
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