分区施工基坑对邻近隧道变形影响的三维有限元分析
发布时间：2019-02-18 13:09
【摘要】：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。
[Abstract]:In Shanghai World Expo area, the first stage of the deep and large deep foundation pit project of Shanghai World Expo area is next to the double-line shield tunnel across the river. The environmental protection of the foundation pit is very high, and the foundation pit is implemented by zoning scheme. The three-dimensional finite element model of foundation pit and adjacent tunnel was established by PLAXIS3D finite element software, and the dynamic simulation of excavation process was carried out by using HS-Small small strain constitutive model. The comparison between the calculated results and the measured results shows that the three-dimensional finite element analysis based on HS-Small small strain soil constitutive model can well simulate the deformation of foundation pit and the influence of excavation on adjacent tunnels. By reducing the scale of a single foundation pit, the zoning construction scheme makes full use of the space-time effect of the foundation pit and plays a good role in deformation control.
【作者单位】： 同济大学地下建筑与工程系;华东建筑设计研究院有限公司;上海基坑工程环境安全控制工程技术研究中心;
【基金】：上海市浦江人才计划(15P51433500)
【分类号】：U456.3;TU753
本文编号：2425869
[Abstract]:In Shanghai World Expo area, the first stage of the deep and large deep foundation pit project of Shanghai World Expo area is next to the double-line shield tunnel across the river. The environmental protection of the foundation pit is very high, and the foundation pit is implemented by zoning scheme. The three-dimensional finite element model of foundation pit and adjacent tunnel was established by PLAXIS3D finite element software, and the dynamic simulation of excavation process was carried out by using HS-Small small strain constitutive model. The comparison between the calculated results and the measured results shows that the three-dimensional finite element analysis based on HS-Small small strain soil constitutive model can well simulate the deformation of foundation pit and the influence of excavation on adjacent tunnels. By reducing the scale of a single foundation pit, the zoning construction scheme makes full use of the space-time effect of the foundation pit and plays a good role in deformation control.
【作者单位】： 同济大学地下建筑与工程系;华东建筑设计研究院有限公司;上海基坑工程环境安全控制工程技术研究中心;
【基金】：上海市浦江人才计划(15P51433500)
【分类号】：U456.3;TU753
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，本文编号：2425869
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