CFG pile strengthening technology of soft ground

This paper studied CFG pile strengthening effect of soft ground, which has low replacement ratio, with multiple field-testing techniques, such as static cone penetration test, plate loading test, low strain dynamic testing and settlement observation. The design method and construction technology of CFG pile were also represented concisely. It is pointed that the bearing capacity of composite foundation after treatment is 1.4~2.0 bold that of natural ground, CFG pile can not compact the soil between piles, in order to guarantee the consolidation time of settlement (50 mm) after projection, it needs no more than 0.5 year to reach the specified settlement for the zone used short piles, and no more than 1.0 year for the zone used long piles, and the rate of consolidation in the zone used short piles is higher than in the zone used long piles. The results indicate that this kind of CFG pile can guarantee bearing capacity and settlement after projection criterion of soft ground.