Characteristics of the excess pore water pressure of the marine liquefied stratum of suction bucket foundations under seismic load

Offshore oil and gas resources are major sources of future global oil and gas increments. Suction bucket foundations are a new type of foundation that is widely used for offshore oil and gas exploitation platforms. Such platforms are often subjected to dynamic loads caused by storms, waves, or earthquakes, which cause the instability and liquefaction of seabed sand layer foundations. These loads jeopardize the safe operation of offshore oil and gas platforms. For this reason, the cyclic elastoplastic constitutive model is adopted in the ocean liquefaction stratum, in consideration of the foundation liquefaction and large deformation effects. To study the changes in the excess pore water pressure of the suction bucket foundation in different ocean liquefaction formation thicknesses under the action of seismic loads.