Geotechnical stability simulation of single bucket offshore platform under vertical cyclic loading

Despite of upper structure failure, emphasis is laid upon the ground silt which is a very common in Bohai Bay. In order to explore the soil stress, reduced-scale tests are performed by groups of transducers. By programming, the model test analysis can be converted into real stress of prototype platform. Then a series of Drucker-Prager yield criteria as well as Mohr-Coulomb criterion are employed to judge the soil stability. By contrast, result derived from DP-2 and DP-4, with M-C results as reference, is adopted. In conclusion, considering vertical cyclic loading alone, foundation silt of the offshore platform is 1) unconditionally stable when 500 tons oil weight is exerted and 2) globally stable when 1000 tons oil weight is exerted. Balancing economic efficiency and engineering safety, daily oil storage of the caisson can be designed 1000 tons.