东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (1): 129-136.DOI: 10.12068/j.issn.1005-3026.2024.01.016

• 资源与土木工程 • 上一篇    下一篇

管幕和横梁作用下大断面开挖变形响应研究

柏谦1, 赵文1, 曹文欣1, 卢彦军2   

  1. 1.东北大学 资源与土木工程学院,辽宁 沈阳 110819
    2.中铁四局集团第五工程有限公司,江西 九江 332000
  • 收稿日期:2022-08-08 出版日期:2024-01-15 发布日期:2024-04-02
  • 作者简介:柏 谦(1994-),男,辽宁铁岭人,东北大学讲师,博士
    赵 文(1962-),男,内蒙古乌兰察布人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51878127)

Study on Deformation Response Caused by Large-Section Excavation Under the Support of Pipe-Roof and Beam

Qian BAI1, Wen ZHAO1, Wen-xin CAO1, Yan-jun LU2   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.The Fifth Department of China Railway No. 4 Bureau Group Co. ,Ltd. ,Jiujiang 332000,China. Corresponding author:ZHAO Wen
  • Received:2022-08-08 Online:2024-01-15 Published:2024-04-02

摘要:

基于管幕与横梁作用下大断面开挖相似模型试验,研究开挖引起的管幕变形和地表沉降变化规律.为充分研究参数变化对管幕变形和地表沉降的影响,运用有限元软件建立三维数值模型,以此模型为依据,分析管幕抗弯刚度和横梁抗弯刚度对管幕变形和地表沉降的影响,并根据模糊数学理论对最优刚度匹配进行研究.研究结果表明:管幕结构整体变形类似于“板”,且关于中间管幕对称,管幕跨中断面地表沉降呈“凹槽”型,符合Peck曲线分布;管幕变形和地表沉降均与横梁刚度和管幕刚度呈指数函数关系,且对横梁刚度变化更为敏感;管幕刚度与横梁刚度分别为0.5D和2K时,可以兼顾安全性与经济性.

关键词: 管幕, 模型试验, 管幕变形, 地表沉降, 刚度匹配

Abstract:

Based on the similar model test of large-section excavation under the action of pipe-roof and beam,the variation law of pipe-roof deformation and surface settlement caused by excavation was studied. In order to fully study the influence of parameter changes on the pipe-roof deformation and surface settlement,a three-dimensional numerical model was established by using the finite element software. Based on this model,the effects of the flexural stiffness of the pipe-roof and the beam on the pipe-roof deformation and surface settlement were analyzed,and the optimal stiffness matching was studied according to the fuzzy mathematical theory. The results indicate that the overall deformation of the pipe-roof structure resembles a “plate”and exhibits symmetry about the middle pipe-roof. The surface settlement of the cross section of the pipe-roof forms a “grooved”pattern,conforming to the Peck curve distribution. The pipe-roof deformation and surface settlement are exponential functions of the beam stiffness and the pipe-roof stiffness,with greater sensitivity to changes in the beam stiffness. The safety and economy can be taken into account when the beam stiffness and the pipe-roof stiffness are 0.5D and 2K respectively.

Key words: pipe-roof, model test, pipe-roof deformation, surface settlement, stiffness matching

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