Abstract:

In order to ensure the safety of foundation pit and retaining wall in the process of excavation and support of foundation pit of Zhujiacun Station on Kunming Rail Transit Line No. 4, comparison is made among different support measures of foundation pit and retaining wall protection schemes, the retaining wall safety indices in every working condition stage of excavation and support of deep foundation pit is analyzed based on numerical simulation and calculation results, and the retaining wall protection scheme with short construction schedule, good economy and high safety is selected. The results show that when the height of the retaining wall is small, the protection of the retaining wall, i. e. shaped steel support with foundation pit support structure, is safe, fast, economic and efficient, which can provide significant reference for the protection of the retaining wall adjacent to deep foundation pit of similar projects in the future.

Key words: cantilever retaining wall, deep foundation pit support, retaining wall protection, numerical simulation