The Applied Research And Practice For The Support Of Foundation Pit Of Internal Bracing-Diaphragm Wall In Fuzhou

China's large number of deep excavation works began in the 1980s. Not only with the rapid urban development of high-rise buildings, but also with the urgent requirement of underground parking, high-rise building, air defense and so on, it is very necessary to build corresponding basement for the high-rise building. The pit depth of some high-rise buildings is about 20 meters and the deeper basement approximately to 4-5 layers, which involves the excavation of the basement excavation and its support. Due to the rapid development in subway engineering during recent years, both subway station and local open-cut involve an enormous amount of excavation works. For example, in the two-lane Cross subway station, the deep of basement excavation is up to 20-30 meters. In addition, both water conservancy and power plants also exist some basement excavation problems, such as underground power house and underground pump station.This paper is on the base of a project, Fujian International Youth Exchange Center Support deep excavation works. By contrast with the five bidders for detailed analysis in pit Support program works, from economy to security the feasibility of program, the Inner-Support Foundation Pit Program is be adopted finally. Paper introduces some methods and schemes, such as Inverse Construct for the design of the wall, BY-Y-law, Construction process. Paper also involves monitoring on beam internal forces, pit displacement, and neighboring buildings settlement. It is show that the rational design methods in similar projects in Fuzhou Pit Support practice entirely are feasible through monitoring results.