Field test study of DX piles

Cast-in-place pile with expanded branches and bells by 3-way extruding arms(DX pile),a new variable cross-section pile,has obvious advantages in bearing capacity and settlement control compared to conventional pile.However,studies of bearing mechanism and settlement characteristic,especially group DX piles,are not sufficient.The bearing capacity and settlement characteristics of single DX pile and group DX piles are analyzed via in-situ model test.Special attention is paid on single and group DX piles comparison under same conditions;at the meantime,the single DX pile and conventional pile with the same pile length,diameter,and the same bearing capacity are compared so as to provide the theoretical references for the bearing capacity design of the DX piles in the engineering practice.