Testing and Analysis on the Quality Problems of CFG Pile Composite Foundation

The stratum of a project site is mainly composed of silt, cohesive soil, and sandy soil, and the groundwater level is high. CFG pile composite foundation is designed. The test results of CFG pile composite foundation show that the bearing capacity of both single pile and composite foundation cannot meet the design requirements. The low strain method and core drilling method were used to detect and compare the quality problems, and the reasons for the quality problems were analyzed. High pressure jet grouting piles were used to reinforce the foundation, and the reinforced composite foundation was tested. The test results show that the bearing capacity of the composite foundation meets the design requirements. The observation results of building settlement indicate that the maximum settlement and overall inclination of the building meet the design and relevant specifications. It can provide reference for solving similar engineering quality problems.