Analysis And Study Of Superstructure-Pile-Raft-Soil Interaction In Super-highrise Frame-Tube Based On The Test On Site

In this paper, the finite element method is used for the analysis and computation of interaction between pile and soil in super-highrise frame-tube. By adopting the layering foundation model, the contact element and the substructure method, the three-dimensional finite element analysis for soil, pile-raft foundation and frame-tube applied by the vertical loads is established. The regularities of pile-top reaction distribution, the carrying load ratio between pile and raft, the settlement and the imparity settlement of foundation in the frame-tube structure and the single wall are influenced by some factors such as the stiffness of the superstructure, the intensity of the soil under the piles, the length and radius of the piles, the distance between the piles, the thickness and the suspended width of the raft. At the same time, in coordination with the analysis and the study based on the test on site, the comparison of theory result with field measurements has been taken, as well as the comparison of frame-tube with single wall interaction behaviors. In this paper, the allocation mode of the piles, that is sparse in the exterior and dense in the interior, and the optimized method based on the settlement control are proposed. Suggestions in ordinary methods of pile-raft foundation design and formula of the carrying load ratio between pile and soil are put forward.