In this paper, flat pile and under-reamed pile are stage loaded for comparative study of integrated displacement and equivalent stress. The results show that the same finite element model, the same soil, the same conditions of pile, under-reamed pile of the expansion of the integrated displacement piles has little effect, while the equivalent stress and equivalent stress distribution of the size of is very large. This shows that in strict accordance with the foundations (JGJ94-2008) used the premise of expanding the bottom of the size, under-reamed pile to reduce the quantity of contribution to the settlement of the pile is little contribution, and for the reduction of excessive concentration of stress to ensure the safety of pile and soil has very great significance.
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