Abstract：The ABAQUS software was used to research the uplift loading and the affected region of ground soil body on pile-bucket foundations of different sizes under same uplift displacement，and preliminary design of pile-bucket foundation was carried out. The sizes of pile-bucket foundation mainly included the pile length under the top of the bucket(L3)，the bucket radius(R) and the bucket wall height(H). The ultimate uplift loading of pile-bucket foundations are various with change of size of foundations. The scope influenced by the uplift bearing capacity of foundation and ground soil body could be highly enhanced if L3，R and H were increased; the influence of change R was most to the uplift bearing capacity of foundation and the ground soil body horizontal scope，and the change of L3 took the second place，and the change of H went the last；the influence of change L3 was most to the ground soil body longitudinal scope，and followed by the change of H and R. When the proportion relation of L3 and R reached 8.0∶1.0，common uplift performance of the pile structure and the bucket structure together could be fully manifest; when the proportion relation of R and H was 0.6∶1.0，the uplift performance of the bucket structure was embodied completely.
