Abstract: With the rapid urban developments, more and more highraised buildings are constructed in the limited urban areas. There is a trend to utilize the underground spacing for these highraised buildings. As a result, the supporting demand for the deep excavation is ever increasing. There are many supporting techniques and their associated design methods available. For a specific deep excavation project, the selection of the supporting method and the appropriate design method are among the first objective. This paper presents a case history of using the cement mixed wall for a deep excavation supporting system. The subsurface conditions, the adjacent construction environment for the proposed deep excavation site as well as the stability analysis of the proposed excavation are introduced.

Key words: Deep Excavation Support, Cement Mixed Walls, Excavation Stability