| Pile-supported and geogrid-reinforced composite foundation is reinforced by pile as vertical enhancing body and by geosynthetics as horizontal enhancing body, and both pile and geosynthetics coordinate and work together. Due to its good performance in control of foundation settlement and differential settlement and multiple technical and economical aspects, it has been widely used in soft soil foundation treatment engineering in recent years.This paper focused on the following aspects, and get some valuable conclusions and achievements:(1) The analysis method of overall stability of pile-supported and geogrid-reinforced composite foundation is reviewed and summarized, and it is further analyzed theoretically. Meanwhile the design and calculation thinking of pile-supported and geogrid-reinforced composite foundation based on index control was presented.(2) The indoor stability model test of pile-supported and geogrid-reinforced composite foundation under flexible load was designed. Calculated the settlement of composite foundation according to several methods, and compared with the vertical settlement field under flexible load measured in the test. According to the results of the test, the stress field and the stability performance of pile-supported and geogrid-reinforced composite foundation was intuitively analyzed. The rules of the bending moment of pile body and stress ratio between pile and soil was obtained during loading.(3) Factors influencing the stability of pile-supported and geogrid-reinforced composite foundation under flexible load was analyzed by finite element software Plaxis, and the influencing degree of the factors to composite foundation was studied. The results of finite element simulation were compared with experimental results.
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