Study On Working Mechanism Of CFG Pile Composite Foundation Which Through Newly DepositsSoil

The CFG pile is the abbreviation for the cement flying-ash gravel pile. It can be used to form compound foundation together with inter-pile soil and cushion course. CFG pile boasts many merits, such as high construction speed, short construction period, easy-to-control quality and low engineering cost, so it has become one of the most popular foundation handling technology in Beijing and areas around Beijing. In the thesis, on the grounds of analysis for CFG pile soil cushion interaction, theoretical formulas of calculating pile-soil stress ratio of CFG pile Composite foundation and settlement are established. D-C Model is writen with fortran 9.1, and the experimental results are in good agreement with the model. Composite foundation's properties are described in detail.On the basis of Finite Element Method theory and composite foundation character, a single-pile composite foundation FEM model is constituted. The model is tested by engineering example. In the FEM model, the contact efects among composite foundation are considered, and contact elements are seted on the interfaces of pile, soil and cushion. Through considerable computer calculations, the mechanism of pile and soil load passing is studied, regularity of friction on the side surface of piles is analysised, cushion thickness and modulus, pile length and so on factors effects on p-s curve, pile stress and deformation and skin friction of the pile, also get some regular conculation, which may offer some reference to Handan CFG composite foundation engineering design.