| Building excavation problems relating to quality and safety, economic cost, the ecological environment for difficulty, duration, and many other technology, is a complicated systematic project involving a number of areas of geotechnical structures and the like, very comprehensive. Rational design of excavation can effectively reduce project costs, improve project quality, and greatly reduce the risk of accidents, avoid loss of personal property. Therefore, the foundation pit design and optimization of the preferred scheme, is a skill that needs further investigation and research problems.Through research and analysis of issues that need to be solved specific engineering excavation occurred during the structural design and a summary of lessons learned from the accident pit, through mathematical optimization theory, biological fuzzy theory, simulation and limited by specific examples of projects for application and verification, the excavation and structural design of the preferred and preferred on the basis of the detailed structure of local design support structure, hoping to provide technical guidance and theoretical support for the relevant similar projects. This paper introduces a detailed summary of domestic and foreign common excavation structure type, and comparative summary of each type of support the scope, limitations and advantages and disadvantages of excavation by a large number of instances, to determine the beginning of the excavation elaborate schemes election principle, qualitatively supporting structure primaries, and then according to the factors and principles of building works related specifications retaining selection and mathematics optimization theory, proposed BRACING quantitative methods, and to demonstrate the use and verified by specific examples of projects, so that readers can more intuitive understanding of the preferred method.Factors affecting the selection of excavation are many. Some of these factors have considerable uncertainty and randomness of these features and fuzzy mathematics theory is somewhat similar, and therefore can be applied to the principle of fuzzy mathematics retaining structure selection, the binding Analytic Hierarchy Process and Fuzzy Comprehensive Evaluation Method, preferably a mathematical evaluation model in safety and quality reliability, technical difficulty of construction, the economic costs, the impact on the surrounding environment of the four indicators evaluated on the basis of optimization objectives,supporting structure type of primaries on model selection Mathematics quantitative preferable. Then Changchun Car City Wanda Plaza business district A District Foundation, for example, using the above method of excavation schemes are preferred. First,according to Foundation level and site conditions of the project a few primaries applies to support programs of the project, followed by the establishment of a comprehensive evaluation model supporting structure were optimized analysis,preferably one or more of the group for this project pit supporting scheme.Preferably after the excavation of the overall program,but also detailed structural design of supporting structure. Taking Changchun City car Wanda Plaza A large area of the business district Foundation,for example,the overall stability, security and economic point of view,through the Foundation for detailed structure design software were analyzed in detail,and finally determine the structure by the finite numerical simulation security. |
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