The Selection And Optimization Of Excavation Scheme

Many kinds of supporting schemes exist in deep excavation engineering. Every kind of scheme has different influence on the whole of foundation pit, including safety, project cost and construction speed. In order to meet such requirements, it’s need to select and optimize the excavation scheme. This thesis mainly discusses the application and improve of the method which is used to select and optimize excavation scheme by high building excavation scheme in Guangzhou Taojin area as an example. Through the Li Zheng deep excavation software operation and the MIDAS GTS FEM software numerical simulation analysis, it will get the data producing in the process of foundation pit construction, including maximum internal forces of retaining structure, maximum horizontal displacement of of retaining structure, soil settlement near the foundation pit, the overall stability of the safety parameter and the resiting upheaval of safety parameter. At the same time, it will get the data of the project cost and construction period by the project cost knowledge and the analysis of network planning figure. Using these data to set up judgment matrix and the single-level sorting( weight vector ][W), the total level of sorting from safety, project cost and construction speed. Through an example to expound the improved AHP using in selecting and optimizing excavation scheme and it would be made reference to select and optimize foundation pit scheme. Contents of this thesis are summarized in the following points:(1)Realize to compare and analyze the data of safety, project cost and construction speed by the Li Zheng deep excavation software operation, the MIDAS GTS FEM software numerical simulation analysis and the network planning figure through the example for selecting and optimizing the high building excavation scheme in Guangzhou Taojin area;(2)Build the judgment matrix by the data of safety, project cost and construction speed through the improved AHP. Select the scheme meeting the requirements of safety, project cost and construction speed using the total level of sorting transformed from the single-level sorting;(3)Study functional relationship between the diameter of supporting pile, the spacing of supporting pile and maximum internal forces of retaining structure, maximum horizontal displacement of of retaining structure, project cost and construction speed. Determine the better diameter of supporting pile and spacing of supporting pile by design parameters optimizing function;(4)Study the design parameter’s the degree of influence on maximum internal forces of retaining structure, maximum horizontal displacement of retaining structure, the overall stability of the safety parameter and the entirety of safety, project cost and construction speed.