Abstract: With the increasingly stringent constraints faced by the large deep excavation support structures, especially in the complex and densely populated urban environments, the selection of support structures is greatly restricted. Combined with the first phase project of the urban renewal unit of Shahe Village No. 5 in the Shahe Street, Nanshan District, Shenzhen, this paper introduces how to select a more appropriate deep excavation support structure when the prestressed ground anchor cannot be used due to the proximity to the planned subway line and the adjacent deep excavation, and when the conventional internal support system cannot be used to avoid the main tower structure. This deep excavation support structure adopts a more innovative reserved platform type, with good excavation support effect. There is no overlap or intersection between the support system and the main structure, which greatly promotes the construction progress of the main structure and provides great convenience for the planned subway construction. It can be used as a reference for similar projects.

Key words: Reserved Platform, Complex Urban Environment, Large Deep Excavation, Supporting Structure