Research on Optimization of p-y Spring Model Applied in Bucket foundation-soil Interaction along Horizontal Direction

As a new type of Marine foundation, barrel foundation has been gradually applied in the field of offshore wind power development. Its stable performance in service is often closely related to the interaction between barrel foundation and Marine soil. In order to evaluate the undrained behavior of bucket soil interaction efficiently and accurately, based on the traditional p-y spring method used to evaluate the stability of pile foundation, the modified p-y spring method is proposed to serve the evaluation of undrained behavior of horizontal bucket soil interaction by comparing the 3D finite element simulation results with the API standard p-y curve and introducing the p-factor and y-factor double correction parameters. In addition, based on the NGI-ADP model, which can effectively represent the nonlinearity of soil materials, a systematic parameter analysis is carried out on the geological conditions of common single-layer and stratified Marine clays, considering the soil shear stiffness coefficient Gmax/su, failure shear strain γfp and other factors. It is found that the y-factor is significantly affected by stratified soil. The p-factor is based on the range between 1.38 and 2.08. Based on the actual project, the application analysis of modified p-y spring method is carried out, and the results show that modified p-y spring method has good adaptability to the actual project site conditions,and finally the response of the barrel-soil interaction under multiple degrees of freedom is investigated for some soil conditions.