大面积深基坑支护结构选型与开挖模拟

Selection of supporting structures and simulation of excavation for deep and large foundation pits

以苏州工业园区某基坑工程为研究对象,一方面研究了层次分析法在大面积深基坑工程支护方案优选中的应用,对比按工程经验选择的结果,检验基坑支护结构选型的科学性;另一方面运用有限元软件MIDASGTSNX对照实际工程进行基坑开挖的仿真模拟,分析模拟结果,评价基坑支护体系的控制变形能力,并对类似的实际工程中可能存在的问题提出建议。研究结果表明,该基坑工程中实际采用的支护方案与层次分析法的决策结果相符,说明该方案科学合理;模拟结果显示的各项位移值均在许可范围以内,说明该支护体系具有较好的控制变形能力。

This paper takes a foundation pit project in Suzhou Industrial Park as the research object.On the one hand,the application of hierarchical analysis method in the selection of support scheme for large-area deep foundation pit projects is studied,and the results selected by engineering experience are compared to test the scien-tificity of the selection of foundation support structure.On the other hand,the simulation of the foundation pit excavation is carried out by using the finite element software MIDAS GTS NX against the actual project,and the simulation results are analyzed to evaluate the deformation control ability of the foundation pit support system,and some suggestions are made for the possible problems in similar actual projects.The research results show that the actual support scheme used in the foundation pit project is consistent with the decision results of the hierarchical analysis method,which indicates that the scheme is scientific and reasonable.The simulation results show that the displacement values are within the permitted range,which indicates that the support system has a good performance in deformation control.