Optimization Analysis About Subway Deep Foundation Pit Supporting Form

In urban development, with the increase of population and the population density, not only urban high-rise buildings and rail traffic develop rapidly, but also the excavation becomes deep, large and complex. There were many incidents of major projects, resulting in many security damage and economic losses. On the other hand, a lot of deep excavation designs overly conservative, causing a huge waste. Therefore, under the premise of safety and quality assurance engineering, it is very important for deep excavation support forms to optimum selection. In this paper, Zhengzhou Agricultural Road subway station and the Yellow River Road station deep foundation are as the engineering background. We analyze the engineering test data and combine with numerical simulation methods to study the deformation characteristics of deep foundation pit underground continuous wall, as well as the influence of excavation on the surrounding environment.Integrated simulation and comparative analysis of various forms of support, to optimize the election type, and then it can guide the design of deep excavation and construction.Specific study contents are as follows:1. It analyzed the current development of deep excavation, the development trend in the form of excavation and the research status of the optimum selection of deep excavation.2. Zhengzhou Agricultural Road subway station and the Yellow River Road station deep foundation pit are as the engineering background, for engineering test data were summarized and analyzed the force and deformation law during excavation branched retaining structure, provided the basis for the design and construction of deep excavation in the future.3. We analyzed the Agricultural Road station deep excavation with FLAC3D software, establish numerical simulation analysis model to simulate operation of the system, focusing on analysis of deformation characteristics during the process of deep excavation and then compare the measured data with the project to verify the reliability of the model parameters.4. We use the FLAC3D software ananlyze different Support Form (inner row of piles support, row piles composite soil nailing, anchor piles composite soil nailing) of subway deep excavation based on the above. We focus on comparative analysis of the deformation and mechanical characteristics of all kinds supporting structure, combined with the cost of various types of support structures, and optimized support in the form of selection, reasonable and feasible recommendations to optimize support, the result is similar to the deep pit after construction and support designed to provide a reference, get on optimum selection of support forms. Reasonable and feasible support recommendations were putted forward to provide a reference for similar construction and supporting design of deep excavation in the future.