Research on Bearing Difference between Single-Pile Composite Foundation Field Test and Group-Pile Composite Foundation of High-Rise Buildings

The reliability of high-rise buildings’ rigid-pile composite foundations primarily relies on the load test results single-pile foundations. Field tests were conducted for a building in loess area China, conformed to design requirements. Nevertheless, buildings experienced significant settlement after construction, which was quite different from results. Investigating bearing disparities between and group-pile structures necessary. Firstly, conducting an indoor interface shear propose pile–soil hyperbolic contact model integrate it into numerical model. Subsequently, finite element employed that accounts interactions order analyze discrepancies bearing. show difference rises by 56.4% as escalates 100 kPa initial level increases 28.9% ascends final level. changes with increasing hardened curve pattern. Furthermore, differences pile characteristics interaction analyzed. Negative friction occurs within 1/4 length foundations, while range contracts 1/10.