Abstract: The side-grouting uplift pile is a newly developed pile foundations. This paper aims to demonstrate the features of deformation and bearing capacity of this class of piles using experimental and numerical approaches. A series of large–scale direct shear tests were performed to show the effects of grouting on the behavior of pile-soil interface. Based on the experimental observations of the large-scale shear tests, the revised coulomb friction model is built and used in the finite element method. The bearing capacity and load-displacement curve for non-grouting and side-grouting piles are obtained respectively. The study results show that the side-grouting uplift pile possesses a larger skin-resistance because its deep critical skin-resistance can be fully developed. As a consequence, the side-grouting uplift pile displays a much higher bearing capacity than traditional uplift pile.

Key words: side-grouting uplift pile, uplift bearing capacity, large-scale direct shear test, numerical simulation