COMPARISON TEST STUDIES ON THE LOAD BEARING CHARACTERISTICS OF POST-GROUTED BORED PILES IN SOFT SOIL

Post-grouting technique injects cement slurry into pile toe along its embedded steel pipe. It can reduce detritus of pile toe and mudcake and is used widely. It is necessary to understand fully the bearing capacity of post-grouted pile. Traditional design method of pile foundation is usually adopted and does not accord with the practical situation. Based on the results of static loading tests of two piles (one is post-grouted and the other not), the bearing properties of the two piles are analyzed comparatively. The load transfer mechanism, such as the axial load and the skin friction distribution law, is studied with the stress gages. It is found that the bearing capacity of the post-grouted pile is about 2.5 times larger than that of the ordinary one. The post-grouting technique can improve the toe resistance and skin friction. It can improve the characteristics of the interface between pile and soil, and increase the bearing capacity and decreases the settlement of pile effectively.