Study On The Interaction Machanism Of The Variable Stiffness Piled Raft Foundation And Soil

Piled raft foundation, which is extensively used, is an important foundation pattern ofhigh-rise buildings. The researches on the interaction mechanism of piled raft foundations andthe soil have been being paid close attention to by academic and engineering circles. As aresult of complexity of interaction of raft-pile-soil system and insufficiency of analyticalmethods, the theory analysis, numerical approach, model experiment and contrast researchand so on are demanded to fully understand it's regular. The piled raft foundations have manytypes in the real project, and the stiffness of piled raft foundation is influenced by the manyfactors such as length, diameter, number, distance or layout of piles and thickness of raft.Firstly, this paper introduces the analysis method of the piled raft foundation with different lengthand diameter piles, which is used in the paper, and the model experiments of variable stiffnesspiled raft foundations in brief. Secondly, the interaction mechanisms of the piled raft and thesubgrade are discussed as follows: (1) By comparing the results of the model experimentswith the computative results, the reasonability and reliability of the numerical method areverified. (2)According to the computation of the five engineering examples, the interactionmechanism of pile-soil system is analyzed. (3) The settlement, soil reaction, pile topreaction, pile axial force and pile shaft friction of the five engineering examples are compared,and optimization of pile layout on piled raft foundations is analyzed.In conclusion, based the above analysis, the optimum layout of piles can reduce thedifferential settlement and decline the cost of foundation projects.