Research on settlement control effect of CFG pile-raft structure based on field test of High-speed Railway

Research purposes: Field tests were conducted at a CFG pile-raft structure working point of Beijing-Shanghai High-speed Railway to investigate the deformation law of reinforced zone and substratum compression and total settlement. A further evaluation was made to investigate the settlement control effect of deep foundation treatment with CFG pile-raft structure. Research conclusions: The result indicates that: (1) The settlement of CFG pile-raft structure meets standard requirements. (2) The substratum settlement is the main part of total settlement, which accounts for 74% of total settlement. (3) The foundation settlement control effect of CFG pile-raft structure is better than that of CFG pile-cap-net. Under current test conditions, the ratio of the former's total settlement to the latter's is 73.5~75%. (4) The analysis showed that, CFG pile-raft structure can be used in preference in unballasted track on soft soil subgrade.