Study On Foundation Pit Support Type Selection And Optimization Design Of Tongzhou Liyuan Commercial Complex Building

In this paper, the selection and optimization design of deep excavation supporting structure is taken as the research object. Combined with the example of Tongzhou pear commercial building foundation pit project, from the access to the theory combing, from the selection to the selection, from the parameter optimization to the determination scheme, This paper systematically expatiates on the method of selection and optimization design of deep excavation support structure, and uses the method of analytic hierarchy process and fuzzy comprehensive evaluation to fully study the selection of supporting structure, Deep foundation pit support design software to optimize the relevant design parameters of trial and selection, in order to determine the optimal design of deep excavation support structure. The main contents and achievements of this paper are as follows:(1) The development and present situation of the deep foundation pit engineering at home and abroad are analyzed, and the characteristics of the deep foundation pit engineering are discussed. The types of supporting structures commonly used in Beijing area are sorted out, and some suggestions are given to the methods and parameters selection and discrimination of earth pressure calculation.(2) Based on the analysis of engineering characteristics, geological conditions and environmental factors, this paper uses the analytic hierarchy process(AHP) to select the index factors first, then use the fuzzy comprehensive evaluation method, Considering the characteristics of each factor, a quantitative comprehensive evaluation result is calculated and the final support structure selection scheme is determined through comparison and selection.(3) After the supporting structure selection is completed, the design scheme of the preliminary design is optimized and compared with the relevant design parameters by using the software of Lizheng Deep Foundation Pit, and the important key parameters influencing the design scheme are judged one by one, So as to determine the parameters which play a key role in the optimization of the design scheme. By further optimizing the combination and calculation of the parameters, the design scheme which is most suitable for engineering characteristics is obtained.Through the feedback of engineering practice, the design scheme of supporting structure determined by the above method can meet the needs of construction safety, and the scheme technology is reliable, and achieved remarkable social and economic benefits. In this paper, the design method of "analysis and design conditions, preliminary structure selection, design parameter selection, software check, determine optimal scheme and information feedback" is simple, feasible and effective, and can be performed in relatively short Time, through the comparison and selection, trial and error to determine the technology is reliable, economical and reasonable support scheme, to ensure the safety of the pit engineering and economic, urban construction and development can provide a reliable technical support and protection, it is worthy of similar pit engineering reference and reference.