Technology Research Of Jinan Yanmazhuang West Metro Station Deep Foundation Excavation

Along with the rapid development of contemporary urban, large-scale underground space development is an inevitable trend. Many underground engineering, the subway can help the reasonable integration of urban functions, planning and urban construction, to solve the urban traffic, economic, and social environment, and other issues, to ease traffic demand continues to grow with the contradiction of traffic congestion, rushed to construction and development around the subway traffic, it must promote the acceleration of underground space development. Deep foundation pit is the foundation of metro station, metro station construction primary problem is the stability of deep excavation of metro station structure, guarantee the safety of foundation pit engineering has important economic significance and social benefits, so the deep foundation pit excavation of a large would be a very important research direction.This thesis expresses the deep foundation pit excavation of a metro station supporting technology and system of precast pile composite and injection of metro station with the new technology of new construction methods such as the role of the deep foundation pit stability.Research include five steps, the first step is construction condition analysis, including project summary analysis, field investigation; The second step is putting forward a feasible deep foundation pit construction scheme on the basis of the specification requirements of "Specification for design of metro" (GB50157-2003), "The construction technology of foundation pit supporting engineering" (JGJ120-2012), "The building foundation engineering construction quality acceptance specification" (GB50202-2002), combining with metro line R1 regional planning of Jinan and Yanmazhuang West station condition analysis. The third step is deep foundation pit stability analysis of plane which is according to the deep foundation pit construction scheme for. The fourth step is the refinement scheme of deep foundation pit construction; The fifth step is innovative research which includes (1) to explore a new method-drilled pile grouting in prefabricated pile construction technology, after the analysis of pile retaining structure strength, stiffness and stability. (2) to investigate the injection system construction and operation management, analysis of injection system on the role of the surface subsidence.