An analysis of the overturning stability of the Maleo Platform has been conducted using the results of a comprehensive, post installation site investigation and interpretation. The jack-up is idealized as a rigid structure supported by a large "A" shape mat foundation. The mat is considered to be an assemblage of independent strip footings. The structure and foundation are idealized as a rigid-plastic system and the upper bound method of plasticity is used to determine the overturning capacity under wave, current and wind loading. A series of 1-g model tests was carried out to validate the analysis method. Based on this analysis, the Maleo Platform is shown to have a safety factor against overturning failure for the 100-year storm loading significantly greater than the requisite value of 1.5.
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