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鉴于地下水渗流作用影响下的基坑工程失稳破坏是地下水位埋深较浅的软土地区常遇的重要工程灾害之一,基于渗流应力耦合理论和修正剑桥模型(MCC),借助大型有限元软件ABAQUS,考虑基坑的降水及开挖工序,结合某工程算例探讨了深基坑的变形性状,主要分析了基坑周边的渗流场变化、地面沉降、开挖面土体隆起及围护结构的挠曲。结果表明,未考虑渗流应力耦合作用的结果偏于不安全,考虑渗流应力耦合作用可更准确地反映基坑渗流与变形情况。
Because of the seepage stress coupling theory and the modified Cambridge model (MCC), the instability damage of the foundation pit under the influence of groundwater seepage is one of the most important engineering hazards in the soft soil area where the groundwater depth is shallow. ABAQUS software, taking into account the foundation pit dewatering and excavation process, combined with an engineering case study of the deformation characteristics of deep foundation pit, the main analysis of the foundation pit around the seepage field changes, land subsidence, excavation surface soil uplift and enclosure Deflection of the structure. The results show that the results of coupling failure without considering the seepage stress tend to be unsafe, and seepage stress coupling can more accurately reflect the seepage and deformation of the foundation pit.