Studyon Numerical Simulation of Load-bearingand Deformation Characteristics of CFG Pile Composite Foundation

The numerical simulation of load-bearing and deformation characteristics of CFG single pile composite foundation and CFG group pile composite foundation are compared,the differences are analyzed from settlement,axial stress of pile,additional stress in soil and pile-soil stress ratio.Then,the numerical simulation of load-bearing and deformation characteristics of CFG pile composite foundation is simulated by changing the parameters of pile spacing,pile length,cushion thickness,soil property of pile end etc.Simulation results show that: There is great difference in load-bearing and deformation characteristics between single pile composite foundation and group pile composite foundation.Whether or not pile and soil between piles of CFG pile composite foundation can form a whole entity,that is concerned with pile length and pile spacing,when pile length is short,it requires a relatively small pile spacing,when pile length is longer,bigger pile spacing can be chosen.The thicker the cushion is,the greater soil share of the load,while the pile smaller share of the load.The load-bearing of composite foundation greatlyimprove when pile end is in the thick hardpan.