岩基地区CFG桩复合地基工作性状试验研究

FG pile composite foundation have been widely used in the eastern coastal areas of china which has the advantage of bigger stiffness, higher carrying capacity and smaller settlement.The CFG piles demonstrate obvious rigid pile characteristics which are filled with the fine concrete instead of the traditional medium materials.The working traits of the rigid pile composite foundation in batholith region is different from other region.The load-settlement curve of 19 CFG piles composite foundation is confirmed through the site load test and we analysis the different situation and the load transfer mechanism of the composite foundation under the circumstances of different piles length in this paper. The tests indicate that the shorter CFG pile is more superiority in batholith region which has significantly end-bearing. The advantages and disadvantages are compared between the Wang qi-tong formula and the Luo jian-qiang formula in calculateing the capacity of CFG pile composite foundation and point that the Luo jian-qiang formula is more suitable in batholith region.The study can supply the design basis of CFG pile composite foundation in the batholith region which has bigger engineering practical value.