大型中央商务区地下空间超深基坑支护施工技术

Construction Technology for Super Deep Foundation Pit Support in Underground Space of Large Central Business District

广州某大型中央商务区基坑周边环境复杂,基坑为四边形,基坑周长约798.8 m,土方开挖深度19.5 m^23 m,基坑支护区段边长约420 m,支护结构设计安全等级一级,基坑重要系数为γ=1.1,有效期一年。该文从基坑支护技术和施工要点等方面进行技术阐述。

The surrounding environment of a large central business district in Guangzhou is complex. The foundation pit is quadrilateral. The perimeter of the foundation pit is about 798.8 m, the excavation depth of the earth is 19.5 ~23 m, and the length of the foundation pit support section is about 420 m. The design of the support structure is safe. At the level of one level, the important factor of the foundation pit is γ=1.1, which is valid for one year. This paper describes the technical aspects of foundation pit support technology and construction points.