Study Of Optimal Method And Optimization Design On Foundation Pit Of Shanghai C0Office Building

Foundation pit supporting project is a complicated and very comprehensive system engineering, which affects quality, progress, cost and environmental protection of the engineering directly and plays an important role in the foundation pit project and the unit construction. View from current situation of domestic and foreign research, though foundation pit supporting obtains rich achievements, there are still one-sided and subjective. Therefore, how designing a complete set of scientific and effective scheme on foundation pit supporting, has become the experts and engineers together matter of seeking.The purpose of choosing the best from multiple supporting system is the goals just like safety, reliability, economy and convenience, the essence of scheme optimization is considered decision problem of multiple target situations. Combining with the Shanghai CO office building foundation pit supporting engineering, this article uses theoretical analysis, model building, and elaborating the detail design of foundation pit construction scheme, making the theory guiding practice and providing a basis for engineering construction.This paper starts from the theoretical analysis. At the beginning, the thesis interprets common supports structure type and applicable scope of foundation pit and slop, which gives the qualitative analysis method for how to selecting the scheme of foundation pit support. Secondly, according to the basic principles and the basis for foundation pit supporting scheme optimization, as well as the fuzzy characteristics between the factors, the comprehensive evaluation model of scheme optimization is established based on the principle of fuzzy mathematics. The evaluation system is divided into two layers and the main index set is composed of safe and reliable, economic, reasonable, feasible and convenient construction, each main index has several secondary indexs. Apply the model to study the foundation pit supporting engineering scheme optimization of Shanghai CO office building, we determine the optimum scheme through the quantitative calculation of the primary schemes, what avoid the partial and irrationality relying on theoretical analysis solely or subjective judgment of technicians and experts, combining qualitative analysis with quantitative analysis commendably.Finally, this paper optimize for the detail research that check the overall stability, basal heave stability, anti seepage stability aimed at the optimum scheme, and study the scheme for construction scheme of groundwater as well as the deformation of foundation pit.