广东工业大学学报 ›› 2016, Vol. 33 ›› Issue (01): 89-94.doi: 10.3969/j.issn.1007-7162.2016.01.017

• 综合研究 • 上一篇    

软土深基坑围护结构水平变形特性研究

刘勇健,刘意美,陈创鑫,王颖,罗启洋,林辉   

  1. 广东工业大学 土木与交通工程学院,广东 广州 510006
  • 收稿日期:2014-09-23 出版日期:2016-01-16 发布日期:2016-01-16
  • 作者简介:刘勇健(1968-),女,副教授,博士,主要研究方向为岩土工程.
  • 基金资助:

    国家自然科学基金资助项目(51178122);广东省自然科学基金资助项目(S2011040004133);广东省大学生创新实验资助项目(1184513036,3110003324)

Research on Deformation Characteristics of Protective Structure of Deep Foundation Pit in Soft Soil

Liu Yong-jian, Liu Yi-mei, Chen Chuang-xin, Wang Ying, Luo Qi-yang, Lin Hui   

  1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2014-09-23 Online:2016-01-16 Published:2016-01-16

摘要: 结合广州某软土深基坑工程实例,建立了地下连续墙、钢筋混凝土内支撑和土层的二维有限元模型,对深基坑开挖过程进行数值模拟.研究结果表明:随着基坑开挖深度的增大,围护结构水平位移增大,最大水平位移的位置由桩顶往下移,而且围护桩水平变形曲线发展形态呈现出向坑内凸的“大肚形”,与实测结果基本一致.支撑结构对减小基坑围护结构的变形起着重要作用,无支撑结构的桩体水平位移最大值达到24.6 mm;土体弹性模量及围护结构刚度对基坑围护结构变形影响较大,桩体水平位移随着土体弹性模量及围护结构刚度的增大而减小.

关键词: 深基坑; 水平位移; 数值模拟; 软土

Abstract: Combined with a project in Guangzhou, the whole model of two-dimensional finite element is established through the diaphragm wall, inner supporting and soil layer. The numerical simulation of deep foundation excavation under the construction process is carried through. Research shows that:With excavation depth increasing, the horizontal displacements of retaining structures increase and the location of the maximum values changes from the top to middle of the retaining structures. The horizontal displacement curves of the retaining structures have a “bow shape”. The monitoring results are compared with the measurement values. The supporting construction plays an important role on the decrease of the horizontal displacement of the pile. The maximum horizontal displacement is 24.6 mm without supporting constructions. And the elasticity modulus of soils has great impact on the foundation displacement. The result can provide valuable references for the design and construction of similar projects.

Key words: deep foundation pit; horizontal displacement; numerical simulation; soft soil

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