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对于环境条件复杂的基坑工程,基坑的变形控制是保证基坑施工安全的一个重要环节,对苏州软土地区的地铁换乘车站大型深基坑的变形特性进行了三维有限元数值分析。考虑土与结构的共同作用以及土体分层开挖和支护结构分区施工,经过有限元建模和计算,成功得出在分步开挖各个阶段中的连续墙的变形、支撑轴力和基坑周围地表沉降等计算值。并且将它们分别与实际监测值进行对比,结果显示计算值和实际监测值吻合较好。说明采用的数值方法可以有效预测基坑开挖过程的变形性状,为工程设计和施工提供一定的指导,有助于完善基坑工程风险性评估的安全预警机制。
For the foundation pit project with complex environmental conditions, the deformation control of the foundation pit is an important link to ensure the construction safety of the foundation pit. Three-dimensional finite element numerical analysis of the deformation characteristics of the large-scale deep foundation pit of the subway transfer station in Suzhou soft soil area is carried out. Considering the joint action of soil and structure, and the subsoil excavation and subregion construction of supporting structure, the deformation, the axial force and the axial force of the continuous wall in each step of the step-by-step excavation are obtained successfully through the modeling and calculation of the finite element method Ground settlement around the foundation pit and other calculated values. Compared with the actual monitoring values, the results show that the calculated values are in good agreement with the actual monitoring values. The results show that the numerical method can effectively predict the deformation of the excavation process, provide some guidance for the design and construction of the foundation pit, and help to improve the safety early warning mechanism of the risk assessment of foundation pit engineering.