The study of mechanism of the lining on CFG pile composite foundation

CFG pile, soil between the piles and lining constitute composite foundation and the technology for lining is always a key for the successful application of the composite foundation. For the problem of effects of actions about lining on CFG pile and composite foundation, through test and according to the text result of three pile composite foundation, this paper discuss the influence of lining thickness and stiffness on pile-soil stress ratio in three pile composite foundations; analyses the different lining thickness on the pile-soil stress ratio of composite foundation; verify the conclusion that the changing of the lining thickness could take a good regulatory role for pile soil load distribution and could effectively reduce stress concentration in the part of the lining bottom; could provide certain reference data for design and construction of CFG pile and composite foundation.