岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 359-365.doi: 10.16285/j.rsm.2018.1310

• 岩土工程研究 • 上一篇    下一篇

轴力自补偿支撑对支护结构受力变形影响研究

黄 彪1，李明广1，侯永茂2，陈锦剑1   

  1. 1. 上海交通大学 土木工程系，上海 200240；2. 上海隧道工程股份有限公司，上海 200032
  • 收稿日期:2018-07-19 出版日期:2018-12-21 发布日期:2019-01-06
  • 通讯作者: 陈锦剑，男，1978年生，博士，教授，主要从事基坑工程与桩基方面研究。E-mail: chenjj29@sjtu.edu.cn E-mail:479306056@sjtu.edu.cn
  • 作者简介:黄彪，男，1993年生，硕士，主要从事岩土工程领域研究。
  • 基金资助:
    国家自然基金项目（No.41330633，No.41602283）；上海市科委人才计划项目（No.16QB1403400）。

Effect of auto-compensating steel struts on stress and deformation behaviors of supporting structures

HUANG Biao1, LI Ming-guang1, HOU Yong-mao2, CHEN Jin-jian1   

  1. 1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200032, China
  • Received:2018-07-19 Online:2018-12-21 Published:2019-01-06
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41330633, 41602283) and the Talent Program of Shanghai Committee of Science and Technology(16QB1403400).

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摘要： 轴力自补偿钢支撑能及时补偿因墙体变形造成的部分预应力损失，实现控制基坑变形的目的。基于自补偿钢支撑作用机制与弹性地基梁法，采用“集中力+弹簧单元”并联作用的混合边界，建立考虑支撑轴力自补偿的连续墙受力平衡方程。将该方法应用于某隧道工程中的基坑工程，模拟以支撑轴力为控制目标的自补偿钢支撑和传统预应力钢支撑作用下基坑施工过程，并对比分析这两种支撑体系对连续墙受力变形发展变化的影响。结果表明，自补偿钢支撑不仅能及时弥补预应力损失，且较预应力钢支撑能更有效限制墙体变形，但过大的轴力控制阈值会引起坑外墙体弯矩显著增大。进一步结合现场试验数据，检验算法合理性。

关键词: 自补偿钢支撑, 弹性地基梁法, 混合边界, 连续墙受力变形

Abstract: Auto-compensating steel struts can supply the part of prestress loss of steel struts caused by wall deformations to unexcavated side and limit deformations of retaining walls effectively. Based on working mechanism of auto-compensating struts and spring-beam model, the mixed boundary condition of single force and springs is used to build the equilibrium of retaining walls supported by auto-compensating struts. Then the process of excavation in a tunnel project using auto-compensating struts and prestressed struts is simulated. The controlling target of auto-compensating steel struts is axial force. The comparison of development of the bending moments and deformation behaviors of retaining walls during excavation is carried out. The results show that the auto-compensating struts can supply prestress loss and limit wall deformations better than prestressed struts. However, bending moments on unexcavated side increases significantly supported by auto-compensating struts. Finally, rationality of the method is proved by comparing with field data.

Key words: auto-compensating steel strut, spring foundation beam method, mixed boundary condition, stress and deformations of diaphragm walls

中图分类号: 

  • TU 91
[1] 徐中华 ，李 靖 ，王卫东 , . 基坑工程平面竖向弹性地基梁法中土的水平抗力比例系数反分析研究[J]. , 2014, 35(S2): 398-404.
[2] 吴 刚 ，白 冰 ，聂庆科 . 深基坑双排桩支护结构设计计算方法研究[J]. , 2008, 29(10): 2753-2758.
[3] 徐长节 ，孙益华 ，李庆金 ，蔡袁强，. 上覆单相弹性层饱和地基上刚性条形基础竖向振动的混合边值问题[J]. , 2005, 26(S1): 105-108.
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