Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site

Coral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for first time to apply CFG pile composite coral sites verify feasibility this scheme and understand its mechanical characteristics. Firstly, taking on-site as research object, a interface shear test was conducted clarify mechanism side friction. At same time, ultimate capacity measured through in-situ static load tests. Then, based on strength parameters revealed indoor tests, numerical simulations were analyze characteristics piles their foundations. Finally, method calculating vertical rigid in considering proposed. The results showed that characteristic values single meet design requirements; friction angle cohesion together increased 64.41%; is mainly borne tip resistance, increase will make proportion then decrease more obviously; soil stress ratio tended stabilize increased. Compared with field results, rationality calculation verified. study may have reference significance construction treatment offshore island reef projects.