Abstract: Geotechnical engineers attach great importance to the uplift problem in design and construction of the deep foundation on the seaside. It is very important to know upheaval of foundation and deformation of support structure due to uplift pile before deep excavation, which can save the project cost and ensure the safety of construction. This case study how to deal with the excavation of open-cut section of Gongbei tunnel. The hard contact model of uplift pile and soil is established. And the simulated results are in good accordance with simulation of the uplift pile. Use the range analysis method to study the effect rule of deformation and stress of the whole support structure caused by the change of the length and diameter of pile. The results are obtained as follows: By increasing the pile length can be more effective to reduce the surface settlement; the larger the pile diameter is, the smaller the deformation of retaining wall is; Increasing the length and diameter of pile can control the upheaval of foundation effectively.

Key words: uplift pile, contact model, numerical simulation, reasonable support