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上海世博片区绿谷一期深大基坑工程紧邻越江双线盾构隧道,基坑环境保护要求高,基坑采用分区方案实施。以PLAXIS3D有限元软件建立基坑与邻近隧道的三维有限元模型,土体采用HS-Small小应变本构模型,对基坑分区开挖的过程进行了动态模拟。计算结果与实测结果对比表明,采用HS-Small小应变土体本构模型的三维有限元分析能较好地模拟基坑的变形以及基坑开挖对邻近隧道的影响;分区施工方案通过减小单个基坑的规模,充分利用了基坑的时空效应,起到了很好的变形控制作用。
Shanghai World Expo Area Lvgu a deep excavation project close to the river double shield tunnel, foundation pit environmental protection requirements, the use of sub-district pit program implementation. The three-dimensional finite element model of foundation pit and the adjacent tunnel was established by PLAXIS3D finite element software. The HS-Small small-strain constitutive model was used to simulate the excavation of foundation pit. The comparison between the calculated and measured results shows that the three-dimensional finite element analysis of HS-Small mini-strain soil constitutive model can well simulate the deformation of foundation pit and the influence of excavation on adjacent tunnels. The size of a single foundation pit, make full use of space-time effect of foundation pit, played a very good deformation control.