HE Jie-bing, HONG Bao-ning, QIU Guo-feng. Research on cushion action mechanism of CFG pile composite foundation for expressway[J]. 2004, 25(10期 刊出日).DOI:
The core technique of CFG-pile (cement fly-ash gravel pile) composite foundation is the setting of cushion
of which the rationality will greatly affect the foundation carrying capacity and distortion characteristic. Based on Terzaghi’s consolidation theory the mechanism of cushion for CFG-pile composite foundation is discussed in detail; and on this way the optimum space between piles
the thickness of cushion
the pile-soil stress ratio and the actual ratio of replacement are deduced. Compared to engineering example
these solutions are quite accurate so as to actually instruct the design of CFG-pile composite foundation.