Abstract: With the continuous development of urbanization, deep excavation projects for the high-rise buildings and subway stations are emerging, and the stability analysis of the deep excavation is gradually gaining the public attention. This paper introduces the key points and difficulties of the design and construction of a deep excavation supporting structure in Guangzhou. The stability of the supporting structure is also evaluated. It is concluded that a large surplus in the stability of the structure and two optimization schemes in order to take into account safety and economy are proposed. Comparing the analytical results, it can be seen that the first scheme is more economical and safer, and it is recommended to take the top 1:1 grading of the deep excavation supporting structure and cancel the second concrete support measures. This investigation result can provide reference for similar projects in the region.

Key words: Deep Excavation Engineering, Factor of Safety, Stability