土工基础

›› 2014, Vol. 28 ›› Issue (2): 75-79.

• 工程实录 • 上一篇    下一篇

深基坑桩锚支护结构数值模拟与现场实测

杨 庆1,钱 霄1,朱连华2,范开全2,陈慧娴2   

  1. （1.四川成都兴蜀勘察基础工程公司， 成都 610072；2.中国矿业大学（北京）力学与建筑工程学院，北京 100083）
  • 收稿日期:2013-11-28 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:杨庆（1969-），男，四川眉山人，高级工程师，研究方向为水文地质、工程地质、环境地质工程等。

Numerical Simulation and field monitoring of Pileanchor Supporting Structure in deep excavation in Chengdu

YANG Qing1, QIAN Xiao1, ZHU Lianhua2, FAN Kaiquan2, CHEN Huixian2   

  1. (1. Sichuan Chengdu Xingshu Investigation and Foundation Engineering Co., Chengdu, 610072;
    2.School of Mechanics & Civil Engineering, China University of Mining & Technology, Beijing, 100083
    )
  • Received:2013-11-28 Online:2014-04-21 Published:2014-04-25

摘要： 利用FLAC3D进行基坑开挖数值模拟，结合桩体钢筋应力与水平位移的现场监测结果，分析了桩锚支护结构桩体受力与变形特征。结果表明：圈梁对桩顶的约束作用明显，在桩顶引起约束横向力与力矩，影响桩体的受力形态；桩身弯矩随着基坑开挖深度的增加而增大，锚杆的位置对桩身弯矩有明显影响；桩身水平位移为两端小中间大，且位移最大值随基坑开挖深度的增加向下发展。

关键词: 深基坑, 桩身弯矩, 水平位移, 数值模拟, 现场监测

Abstract: The deep excavation receives more and more attentions with the development of the urban construction. This paper presents the numerical analysis using FLAC3D on a deep excavation in Chengdu City. The stress characteristics of ground anchors and soldier piles are studies and compared with the pobserved stress in the rebars and the horizontal displacement. The results indicate that the walers have strong constrains on the deformation of the soldier piles. The constrains induce the shear bending moment at pile head and affect the global stress field in the soldier pile; The bending moment in pile increases with the excavation depth; The location of ground anchors has significant effect on the moment in the pile; The maximum deformation along the soldier pile is at the middle and its location is lowered with the increase excavation depth.

Key words: Deep foundation pit, bending moment, horizontal displacement, numerical analysis, field monitoring