The performance of the side-friction resistance of large diameter bored pile

Large diameter bored piles are being used widely. The model of side-friction resistance of them is very important to pile load capacity. Therefore, the hyperbolic model has been presented basing on self-balanced test data of 6 piles of certain project. By using this model, the test pile data was analyzed with two different numerical calculation methods. Furthermore, the results was discussed and compared. From the computative data, the feasibility of the model is doubtless. Secondly, the value of b is exact ascertaining by both simple and integrative analysis method. But the value of a educed by simple method is more rational and steady than by integrative one. Thirdly, the less ultimate value of side-friction resistance of soil is obtained by hyperbolic model analysis. Besides, the design value of soil can be sought when the settlement of pile reaches the 0.25%D. Lastly, the value of the original stiffness and side-friction resistance of soil is larger by grouting.