Optimizing Method Of Supporting System Of Deep Foundation Pit Under Complex Environment Conditions

In the construction of the international tourism island, different types, different style, different needs and different complex degree of buildings are being built in Hainan island, and the scale, depth, complexity of the foundation pit are also constantly increasing, the requirements of the technology used in the supporting system of foundation pit are improved continuously. How to choose a safe, economic scheme which used in the supporting system of deep foundation pit in a complex environment condition haven became a real need. This paper introduces a layer analytical method and fuzzy comprehensive evaluation method to analyze the scheme of selecting a good supporting system of foundation pit of HeXin square, then follow the tracks of monitoring and analyze the data which from the construction of foundation pit of HeXin square. The research contents and main achievements in this paper are as following:(1)In this paper, the production background, the principle and calculation steps of the analytic hierarchy process and fuzzy comprehensive evaluation method are summarily analyzed, and use fuzzy comprehensive evaluation method to choose the scheme of supporting system of deep foundation pit that has a variety of attributes and fuzzy characteristics, on the basis of analytical hierarchy process, concluded the inferiority of the schemes;(2)Construct an evaluation index system about scheme of the supporting system of deep foundation pit as the basic criteria such as safe and feasible, reasonable and economy, environmental protection, convenient construction, and establish the fuzzy comprehensive evaluation table. By using analytic hierarchy process to analysis the12factors redistribute index weight about the supporting system of deep foundation pit. Total weight vector-valued: W=(0.01920.01920.01920.04850.02880.35090.06200.03550.09150.03240.01780.0589), this paper argues that the weight distribution value in Hainan island has general significance.(3)This paper introduces a typical example of the foundation pit of HeXin square, by using analytic hierarchy process and fuzzy comprehensive evaluation method to select the right scheme of supporting system of deep foundation pit in this square, and then track monitoring and data analysis are used in the construction, and then, through the analysis of the monitoring data to adjust the support scheme and the construction speed, achieve informative construction then solve the problems which are founded in foundation pit construction.(4)Comprehensively analysis the foundation pit accident in HeXin square, discuss the influence that the "water" produced on the structure deformation of the supporting system of deep foundation pit and the surrounding environment (West side retaining wall and south side office building etc.). Some suggestions are put forward in the end.