土工基础

›› 2014, Vol. 28 ›› Issue (2): 87-90.

• 工程实录 • 上一篇    下一篇

复杂环境下深基坑开挖过程的三维有限元分析

吴其刚1，何 娜2，郭红燕3   

  1. （1.湖南益阳工程公司，湖南益阳  413000；2.广东理工职业学校，广州 510500；3.华南理工大学 土木与交通学院，广州  510641）
  • 收稿日期:2013-12-19 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:吴其刚，男，汉族，本科，湖南人，研究方向为工程项目管理。
  • 基金资助:

    基金项目：国家自然科学基金资助项目(51108190)

Simulation of Construction Process of Deep Foundation Pit inComplex Environment

WU Qigang1, HE Na2, GUO Hongyan3   

  1. （1. Yiyang Construction Engineering Group Co., Ltd, Yiyang Hunan 413002；
    2. Guangdong Polytechnic Institute, Guangzhou 510500；
    3. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641
    ）
  • Received:2013-12-19 Online:2014-04-21 Published:2014-04-25

摘要： 以深圳某深大基坑工程为背景，运用大型有限元软件，建立了基坑开挖支护三维有限元计算模型。分析了复杂环境下新建基坑土层与支护结构变形规律及紧邻既有基坑变形特性，且与实测结果进行了对比分析。研究结果表明：既有基坑的位移增量随着新建基坑开挖尺寸的增大而增加，故深基坑开挖过程中每一步开挖尺寸变化不宜过大，以防引起既有建筑物位移的显著变化。靠近既有基坑一侧土压力相对更小，新建基坑开挖应力释放引起的围护结构向临空面移动效应得到弱化，该区域土层位移减小。与实测结果对比分析表明，数值计算模型具备合理性。

关键词: 深基坑, 受力变形规律, 三维有限元, 复杂环境

Abstract: This paper presents a case study of a deep excavation project in Shenzhen. The excavation process is simulated with threedimensional finite element analysis. The deformation characteristics of the foundation soil, supporting structures as well as the adjacent excavated pit under complex conditions are analysed and compared with the actual monitored values. The results indicate that the deformation increases with the depth of the dimension increase of the newly excavated pit. Therefore, the dimension change at each excavation stage should not be too large in order to induce the excessive deformation of the adjacent buildings. Near the excavated pit side, the deformation is relatively small due to the relatively low earth pressure changes. The comparison between the predicted deformation and the observed deformation values indicates that the numerical analysis is appropriate.

Key words: Deep Excavation, Deformation Characteristics, Threedimensional Finite Element Analysis, Complex Environment