This paper presents the results of a series of numerical analyses of caisson foundations embed-ded in a homogeneous soil deforming under undrained conditions. The performance of a typical caisson founda-tion under separate axial, torsional and lateral forces is investigated, followed by the interaction of these forces with each other. The lateral force is applied at various points along the skirt of the caisson so that the effects of overturning moments are also included in the analyses. The ultimate capacity of the caisson under combined loading is presented in the form of failure envelopes in the axial-lateral, axial-torsional and lateral-torsional load-ing planes and the axial-lateral-torsional loading space. The results of this study show that although the capacity of the caisson under lateral load depends on the location of the padeye along the caisson skirt, a unique failure envelope, in a non-dimensional form, can be presented for the caisson regardless of the location of the padeye.
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