| In the recent several dozens years, composite foundation using and developing rapidly in our country, many kinds of composite foundation Processing methods appears in abundance. Because the CFG pile composite foundation has the project characteristics of the applicable scope is broad, the enhancing scope of bearing capacity to be big and the adjustment is strong, subsidence slightly after project, the quality of construction can be guaranteed easily, the economic efficiency is good project and so on. It is used in projects widely.This dissertation has summarized the application, development and research of CFG pile composite foundation. And through the theory discussing and numerical calculation to research the CFG pile composite foundation's Load bearing character .The main work as follows shows:1. Analyzing the Reinforces the mechanism of CFG pile.2. Analyzed the pile body compound ground supporting capacity area tocompare with the stress formula between the relations.3. Discussed《constructed Ground Processing Technology standard》(JGJ79 -2,002) in the standard to calculate the CFG pile compound ground supporting capacity characteristic value to be smaller than the load experiment definite compound ground supporting capacity characteristic value reason, and the union example performed to show.4. Discussing the serviceability and good and bad points of the CFG pile composite foundation's several type calculation methods of subsidence, analyzing the deviation reasons in the calculation of subsidence and discussing the several problems in the calculation of subsidence, which should pay attention.5. Using ADINA finite element to analysis the influence factors of the CFG pile composite foundation 's characteristics of bearing capacity and subsidence, as loading level, the different thickness and material of mattress breaker strip, pile length, pile's module.
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