Field experiment of pile-soil stress ratio of pile-raft (net) composite foundation

Pile-soil stress ratio is an important design parameter in rigid pile composite foundation,through long-term observation of CFG pile-raft(net) composite foundation and PHC pile-raft composite foundation changes of pile-soil stress ratio were obtained by field test.Analysis of pile-soil stress variation and comparative study of the lateral distribution of pile-soil stress,pile-soil stress variation,pile-soil stress ratio and load sharing ratio,etc.The results indicate that pile-soil stress ratio increases with the non-linear relationship between load filling,pile-soil relative stiffness and pile-soil stress ratio is closely related to;Lateral pile-soil stress distribution is irregular zigzag and clear stress concentration formed in the top of the pile,in the early filling,soil between piles bear more load,then pile-soil differential settlement and geogrid cushion and adjust the pile-soil load sharing cause the pile to bear more load,pile-raft(net) composite foundation bearing mechanism under embankment load is revealed.