Abstract: The circular bracing structure is getting popular as a supporting system for the deep excavations. This paper presents a case history of applying the large diameter (109 meters in diameter) single layer circular bracing structure in a deep excavation in Puning City, Guangdong Province. The design and construction aspects of the circular bracing system are summarized here in the paper.

Key words: large diameter single layer circular bracing structure, supporting system, deep excavation supporting