Abstract: With the increase in building density in the city of soft soil district, there are often buildings around the deep-pit projects. It results in strict environmental constraints on deep excavation. It is mandatory to consider that the additional deformation brought by excavation can meet the strict requirements of the surrounding buildings in the design of deep pit project. So pit design is restricted by deformation control other than strength control. Corresponding calculation and analysis method using FEM is brought forward based on the numerical simulation analysis of the deep excavation adjacent to buildings. Calculations and analyses of the additional deformation brought by excavation to the surrounding preservation architectures are made towards the different preservation forms between pile foundations and shallow foundations. The calculation and analysis are also compared with the in-site testing results, so the necessity and reliability of calculation and analysis are validated, which provides a useful reference to the design and construction of similar deep excavation projects.

Key words: excavation engineering, adjacent building, pile foundation, shallow foundation, additional deformation, numerical analysis