Application of High Bearing Capacity CFG Pile Composite Foundation

The characteristic value of bearing capacity reaches 620～650 kPa in a super-high-rise building in a residential area in Nanning, Guangxi. Based on the application of CFG pile composite foundation, the single pile reinforcement Q-s curve, composite foundation P-s curve and building settlement observation data of the four high-rise buildings in the project are analyzed. The analysis results show that it is feasible to apply high-capacity CFG pile composite foundation for high-rise buildings in this area. The CFG pile of this project uses rock as the bearing layer of the pile end, which has a high bearing capacity. The thickness of the cushion layer should be adjusted appropriately during design and construction to give full play to the advantages of single pile high bearing capacity. The Geotechnical Engineering Investigation Standard for High-Rise Buildings uses the measured composite foundation deformation modulus to calculate the settlement and the results are relatively close to the actual, but there are still some deficiencies.