基于MIDAS软件探讨施工工序对深基坑稳定性的影响

基于武汉地铁名都站深基坑工程与水文地质勘察资料，建立了三维工程地质仿真计算模型。依据名都站深基坑开挖支护方案，利用有限元软件MIDAS的摩尔-库仑本构模型，对武汉地铁名都站深基坑施工过程中，不同施工工序下每步开挖之后，基坑的变形情况做仿真模拟计算，并对比分析其对基坑稳定性的影响。结果表明：基坑围护结构的变形情况与施工工序有很大的关系，施工工序越合理，上部土体变形越小，反之越大。因此，在基坑工程的施工过程中，要注重施工步骤的划分与合理安排，从而保证基坑工程的安全。研究成果为以后武汉地区基坑工程的施工设计提供了值得借鉴的经验。

Research on Influence of Construction Procedures the Stability of Deep Foundation Pit by Software MIDAS

On the basis of hydrogeology data, Mohr-Coulomb constitutive model in software MIDAS was employed to simulate the deformation of deep foundation pit after each excavation step of different construction procedures. The influence of construction procedure on the stability of deep foundation pit was also analyzed. The deep foundation pit of Mingdu Station of Wuhan Metro was taken as a case study. Results show that the more accurate the construction process is, the smaller the deformation of the upper soil. Therefore, the construction steps must be rationally divided and arranged to ensure the project safety. The present research serve as an  experience for the design and construction of foundation pit for Wuhan Metro.