Research methods: In combination with the engineering practice of reinforcing soft compound subgrade in Wuhan experiment section of Wuchang-Guangzhou Passenger Dedicated Line with CFG pile, the systematically applied researches are done on the application of CFG pile by long auger machine in reinforcing compound subgrade of passenger dedicated line , including the choose of construction method , design of technical process and quality control , according to the engineering geological conditions.
Research results: With the considerations of the performances of common construction machinery for CFG pile, geological conditions suited for CFG pile, quality of pile formation and its influence on the adjacent pile, and the features of CFG pile by long auger machine, it can better meet the requirements of bearing capacity and deformation value of design, better control of post-construction settlement, good reinforcement result and financial feasibility.
Research conclusions: CFG pile by long auger machine is suitable for reinforcing the compound subgrade of passenger dedicated line.
2007, Vol. 24 
