| The technical of composite foundation in China has been developed rapidly in the recent ten years, many kinds of composite foundation treatment method to have appeared, CFG-pile composite ground gene has wide application range, such as improving capacity, ensuring the construction quality and economy benefit, so it is widely used in engineering.The paper is based on a residential buildingthe in Hi-tech district of Xian city, first conduct the numerical simulation of single pile composite foundation, the settlement regularity study, settlement and CFG-pile body axial stress and pile body vertical displacement variation; secondly, the paper illustrates that CFG-pile composite has a good reinforcement effect through compareing natural foundation with CFG-pile composite foundation for the same load; finally. this paper analyzes the settlement of foundation, different subsidence, settlement of pile and soil, stress variationthe of CFG-pile in different position, and research the relationship between pile-soil cooperative work and expound the rule.
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