Abstract: The working traits of rigid pile composite foundation in batholith region is different from other region. Load-settlement curve of 19 CFG piles composite foundation is confirmed through the site load test and load transfer mechanism of the composite foundation with different piles length is discussed in this paper. The test results indicate that the settlement is small and long pile base resistance has certain hysteresis while short pile with significant end-bearing capacity. The settlement ideal model of CFG piles composite foundation in batholith region is proposed based on existing research results. The research can supply the design basis of CFG pile composite foundation in the batholith region which has bigger engineering practical value.

Key words: CFG pile composite foundation, end-baring, shaft resistance, batholith region, work traits