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<p>In order to investigate the long-term stability of subway shield tunnel surrounding rock crossing layered rock formations, this study first researched the numerical algorithms and solution procedures for the three-dimensional Nishihara creep model and the ubiquitous-joint model that characterizes the layered rocks. Additionally, a load damage variable was introduced, and the plastic model in the original Nishihara constitutive model was replaced with the ubiquitous-joint plastic model, thus establishing a three-dimensional nonlinear Nishihara-ubiquitous joint creep damage model. The study then focused on analyzing the long-term characteristics of the surrounding rock under different joint angles and creep times using the layered rock surrounding the shield tunnel in Nanchang as the research subject. The results indicated the following: 1) The secondary development model effectively represents the three-stage creep mechanical characteristics of layered rocks, and the simulation results confirm the rationality of the developed creep constitutive model. 2) With increasing creep time, the displacement of the shield tunnel surrounding rock gradually increases, and the plastic zone expands. 3) The displacement and plastic zone of the surrounding rock exhibit noticeable anisotropy among different joint angles. Therefore, the rationality and feasibility of the developed model were verified through practical engineering applications, providing valuable insights for the long-term stability analysis of tunnel surrounding rock structures in similar layered rock formations.</p>

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Stability analysis of metro shield tunnel surrounding rock based on an improved nonlinear creep-joint coupled damage model

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Haopeng Jiang,
  • Hui Wang,
  • Fengrui Zhang,
  • Wei Yin,
  • Xianzhuo Wang

摘要

In order to investigate the long-term stability of subway shield tunnel surrounding rock crossing layered rock formations, this study first researched the numerical algorithms and solution procedures for the three-dimensional Nishihara creep model and the ubiquitous-joint model that characterizes the layered rocks. Additionally, a load damage variable was introduced, and the plastic model in the original Nishihara constitutive model was replaced with the ubiquitous-joint plastic model, thus establishing a three-dimensional nonlinear Nishihara-ubiquitous joint creep damage model. The study then focused on analyzing the long-term characteristics of the surrounding rock under different joint angles and creep times using the layered rock surrounding the shield tunnel in Nanchang as the research subject. The results indicated the following: 1) The secondary development model effectively represents the three-stage creep mechanical characteristics of layered rocks, and the simulation results confirm the rationality of the developed creep constitutive model. 2) With increasing creep time, the displacement of the shield tunnel surrounding rock gradually increases, and the plastic zone expands. 3) The displacement and plastic zone of the surrounding rock exhibit noticeable anisotropy among different joint angles. Therefore, the rationality and feasibility of the developed model were verified through practical engineering applications, providing valuable insights for the long-term stability analysis of tunnel surrounding rock structures in similar layered rock formations.