Abstract
Centrifuge model tests of belled pile and straight pile in sand were performed in order to investigate the characteristic of uplift resistance behavior of belled pile embedded within deep deposits. A numerical analysis with finite element method was also carried out to clear uplift resistance mechanism of belled pile. The results of this study can be summarized as follows: 1. As centrifuge model test results, the uplift resistance force of belled pile was larger than that of straight pile with the same in axial diameter. 2. The thickness of influence zone in the ground to uplift resistance of bell enlargement was a range of between 2D to 3D (D:diameter of bell enlargement ) from the tip of belled pile upward. 3. It is indicated that the uplift resistance force of bell enlargement increased with a rise in the shear stress on sliding surface near the pile shaft caused by increasing of the lateral pressure in the ground.
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