Abstract: Insufficient weight of the overburden soil above the basement roof, continuous rainfall and the blockage of the drainage well usually lead to the uplifting movement of the basement. The field investigation indicated that the uplifting caused cracks at the sidewall, roof and other locations of the basement. By installing drainage wells and basement floor pressure release holes, the basement uplift movement was greatly alleviated. However, the damage caused is irreversible, especially the integrity of the pile foundation is unknown. To explore the basement uplift movement induced pile foundation integrity and failure modes, the commercial finite element analysis software ABUQUS is used to conduct the numerical simulation of the basement movement. The results show that, after the basement movement, the bonding between the pipe pile and the backfill core is damaged. Subsequently, the pipe pile settles slightly under the gravity, and the displacement of the core increases with the pile cap and the bottom plate under the buoyancy. Therefore, the problem of basement uplift movement should be paid attention to, and the damage caused by the basement uplift movement to underground projects should not be ignored.

Key words: Uplifting of Basement, Failure Modes of Pile Foundation, Finite Element Analysis, Field Survey