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以武汉地铁二号线名都站深基坑工程为研究对象,对现场监测数据进行了详细分析。采用有限元数值分析方法,借助于著名的岩土工程软件MIDAS/GTS建立了三维工程地质仿真计算模型。根据基坑现场实际开挖情况,采用弹塑性摩尔—库仑本构方程和实际应力与位移边界条件,计算得出了不同施工工序条件下基坑围护结构同一断面对应的基坑围护桩的位移云图和变形曲线,从而对深基坑分步开挖过程中支护结构的水平变形规律进行了研究,并将计算结果与监测结果进行了对比分析。结果表明:计算结果和监测数据基本吻合,说明模型和参数的选取及施工阶段的划分是合理的,且计算结果能较好地模拟深基坑开挖过程中围护结构的变形特性。研究成果对模拟超前开挖基坑并预测其变形特性具有积极的科学性,对下一步施工防护方案的及时修正具有重要的指导意义。
Taking the deep foundation pit project at Meidu Station of Wuhan Metro Line 2 as the research object, the on-site monitoring data were analyzed in detail. Using finite element numerical analysis method, with the help of the well-known geotechnical software MIDAS / GTS, a three-dimensional engineering geology simulation calculation model was established. According to the actual excavated conditions in the pit, the elasto-plastic molar-Coulomb constitutive equations and the actual stress and displacement boundary conditions are used to calculate the corresponding foundation pit retaining piles under different construction conditions Displacement and deformation curves of the deep excavation so as to study the horizontal deformation of the supporting structure during the step excavation of the deep foundation pit. The calculation results and the monitoring results are contrastively analyzed. The results show that the calculated results are in good agreement with the monitoring data, indicating that the selection of models and parameters and the division of construction stages are reasonable. The calculated results can well simulate the deformation characteristics of the retaining structure during deep excavation. The research results have a positive scientificalness to simulate the advanced excavation of the foundation pit and predict its deformation characteristics, which is of guiding significance to the timely revision of the construction protection scheme in the next step.