Abstract: With the rapid development of urban areas, the land usage in the city center is becoming increasingly demanding. How to maximize the safety and stability of adjacent buildings has become the most important issue to be solved in deep excavations. This article combines engineering practice to study the design and construction of deep excavations, which is adjacent to preserved buildings in the city center and shares basement exterior walls. The internal force and deformation of the deep excavation supporting structure near the existing building were verified using a Tongji Qimingxing software. The impact of foundation excavation on the adjacent building outside the excavation area was analyzed using a two-dimensional finite element software. At the same time, the selection of deep excavation support plans under space constraints, as well as the design and construction focus of the common wall parts with buildings under construction, were introduced. The technical difficulties in the design and construction of deep excavation support for the adjacent preserved and under construction buildings in the city center were successfully solved, which can provide reference for similar projects.

Key words: Adjacent to Preserved Buildings, Shared Basement Exterior Wall, Finite Element Analysis, Selection of Support Plans