During the operation of the Jack-up rigs, spudcan foundations need to be installed to provide the necessary bearing capacity. The displacement of the soil caused by spudcan has a negative impact on adjacent pile foundation. In this paper, the applicability of the Coupled Eulerian-Lagrangian method is investigated. The factors that influence the pile vertical bearing capacity including grid size, loading speed and Lagrangian stratum depth are analyzed in dynamic explicit finite element programs. The influence of penetration speed on the pile bending moment is studied. Pile vertical bearing capacity after spudcan penetration and extraction are compared with that before. Studies has shown that the grid size of 0.25d (d is pile diameter) and pile loading speed at 5cm/s can calculate pile vertical bearing capacity accurately. The finite element calculation results of pile bending moment are in good agreement with the results of the centrifuge experiments when 0.3L (pile length) is embedded in the Lagrangian entity. The spudcan penetration speed at 8m/s is appropriate for calculation of the pile bending moment. Additionally, after spudcan penetration and extraction, the vertical bearing capacity of the pile foundation adjacent to the spudcan are reduced by less than 10%.
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