岩土力学 ›› 2022, Vol. 43 ›› Issue (8): 2123-2135.doi: 10.16285/j.rsm.2021.1457

• 基础理论与实验研究 • 上一篇    下一篇

隧道分级让压支护作用下围岩 弹塑性变形全过程解析

董建华1, 2，徐斌1, 2，吴晓磊1, 2，连博1, 2   

  1. 1. 兰州理工大学 甘肃省土木工程防灾减灾重点实验室，甘肃 兰州 730050； 2. 兰州理工大学 西部土木工程防灾减灾教育部工程研究中心，甘肃 兰州 730050
  • 收稿日期:2021-08-30 修回日期:2022-03-22 出版日期:2022-08-11 发布日期:2022-08-17
  • 作者简介:董建华，男，1980年生，博士，教授，主要从事隧道与边坡静动力分析方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金（No. 52178335）；中央引导地方科技发展资金（No. YDZX20216200001739）；陇原青年创新创业人才（团队）项目 （No. 2020RCXM120）；兰州市十大科技创新项目（No. 2020-2-11）；甘肃省知识产权局高价值专利培育和转化项目（No. 20ZSCQ034）；甘肃省基础研究创新群体项目（No. 20JR10RA205）。

Elastic-plastic deformation of surrounding rocks under graded yielding support of tunnel

DONG Jian-hua1, 2, XU Bin1, 2, WU Xiao-lei1, 2, LIAN Bo1, 2   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2021-08-30 Revised:2022-03-22 Online:2022-08-11 Published:2022-08-17
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52178335), the Central Government Guides Local Science and Technology Development Fund Projects (YDZX20216200001739), the Longyuan Youth Innovation and Entrepreneurship Talent (Team Project) (2020RCXM120), the Ten Science and Technology Innovation Projects in Lanzhou City (2020-2-11), the High Value Patent Cultivation and Transformation Project of Gansu Intellectual Property Office (20ZSCQ034) and the Gansu Basic Research Innovation Group Project (20JR10RA205).

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摘要： 为了解决高地应力软岩隧道支护结构失效等问题，基于合理释放围岩应力、减小支护结构受力等原理，提出了液压式隧道分级让压支护结构。考虑开挖面的空间效应及围岩应变软化条件，通过分析虚拟支护力的衰减规律，建立了围岩压力、虚拟支护力与支护反力的静力平衡方程，研究了各阶段支护结构与围岩的协同作用，得到了围岩在支护结构变形全过程的位移与应力变化关系，揭示了该支护结构的支护效果。通过算例分析与数值模拟，结果表明：围岩应力在两次让压阶段显著释放，围岩变形特点与结构让压特性保持一致；理论计算值与模拟值的变化趋势一致，验证了理论分析的合理性；所提出结构能有效释放围岩应力，减小支护结构受力，避免了支护结构的屈服破坏，解决了高地应力软岩隧道支护难题，为该支护结构的应用与发展提供了理论支持。

关键词: 隧道工程, 应力释放, 全过程解析, 虚拟支护力, 应变软化

Abstract: In order to solve the failure of support structure of tunnel in high stress soft rock, based on the principle of reasonably releasing the stress in surrounding rocks and reducing the stress of support structure, a hydraulic tunnel graded yielding support structure is proposed. Considering the spatial effect of the excavation surface and the strain softening condition of the surrounding rocks, by analyzing the attenuation law of the virtual supporting force, the static balance equation of stress in the surrounding rocks, the virtual support force and the support reaction force is established. The synergy between the supporting structure and the surrounding rocks at each stage is studied to generate the relationship between the displacement and stress of the surrounding rocks in the whole deformation process of the support structure. The supporting effect of the proposed graded yielding support structure is revealed. The results show that the stress of surrounding rocks is significantly released at the two yielding stages and the deformation characteristics of surrounding rocks are consistent with the yielding characteristics of structure. The simulation results show the consistent variation trend with that of the theoretical values, which verifies the rationality of the theoretical analysis. The proposed yielding support structure can effectively release the stress in the surrounding rocks and reduce the stress of the supporting structure. It can avoid the yield failure of the support structure, solving the support problem of the tunnel in the soft rock with high stress, which can provide theoretical support for the application and development of the support structure.

Key words: tunnel engineering, stress relief, whole process analysis, virtual support force, strain softening

中图分类号: TU 448
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