Research And Application Of Optimization Design Methods Of Foundation Pit Support In Hainan

Now, the utilization of underground space is more and more high. Many projects are going underground and deep foundation pit engineering is constantly emerging. But more and more engineering problems have been exposed. The optimization design of foundation pit engineering has very important significance. This article collects a lot of information related to the optimization design of foundation pit engineering at home and abroad, and summarizes the research development of the optimization design of foundation pit engineering. This article puts forward the optimization method aiming at the design of foundation pit engineering of Hainan area, mainly divided into two steps: optimization of supporting schemes and detail structure optimization. Thesis mainly include:(1) This article discuss the common earth pressure theory, and analyzes the structure and the classical earth pressure of soil pressure difference,and summarizes the basic theory of deep foundation pit supporting design,and discuss the advantages and disadvantages of various common schemes and the applicable condition;(2 ) Multi-objective decision-making fuzzy theory and analytic hierarchy process(APH) have a detailed introduction,and the paper sets up the proper evaluation index system for the optimizing the supporting schemes of deep foundation pit engineering of Hainan area, and codes scheme optimization by the MATLAB software, and find the feasibility of the method by the analysis of specific engineering example ;(3 ) After multi-objective decision ,we get the appropriate support scheme, and use F-SPW 7.0 software principle is deep foundation pit of the pile anchor supporting detail structure optimization design variables and the relationship between the maximum deformation of foundation pit, sensitivity analysis to choose the appropriate optimization variables, the circumference direction of the foundation pit supporting structure unit length of construction cost as the optimization goal to establish the corresponding objective function and constraint conditions, and choose the main to construct a suitable pile anchor support more detail mathematical model of structure optimization design;(4) Using mathematical analysis software of MATLAB to solve mathematical model,and the optimized results compared with the original design, analyses the optimization results, adopting the optimization principle is F-SPW 7.0 software after internal force and deformation of foundation pit supporting structure, practice shows that after optimization can largely reduce the project cost.