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<p>The phenomenon of valley (slope) shrinkage deformation that occurs during the initial stage of construction and water storage in the high arch dam reservoir area has the characteristics of large and irreversible deformation values. Due to the presence of numerous structural planes in the slope, it often manifests as discontinuous deformation characteristics, which affects the safety of the dam. To study the complex interaction between high slope rock mass and internal discontinuous structural planes, and their influence on the valley deformation of high arch dams, this article relies on the Jinping I High Arch Dam to analyze the discontinuous deformation behavior of high slope rock mass containing structural planes. This article introduces two discontinuous deformation characteristics analysis methods, one is the FEM–SPH coupling analysis method and the other is the Nonlinear Spring Element method. The FEM–SPH coupling analysis method considers the medium type of the structural plane itself and the transformation of boundary conditions, while the Nonlinear Spring Element method adopts the new structural plane constitutive model proposed in this article. The application of the constitutive relationship of structural planes at the interface between structural planes and rock mass was considered while conducting discontinuous deformation characteristics analysis. The results show that the simulation of valley deformation in Jinping I High Arch Dam shows that the deformation calculation results of the FEM–SPH coupling analysis method have not converged as a whole, while the deformation calculation results of the Nonlinear Spring Element method are close to the elastic–plastic Finite Element Method (FEM) and actual monitoring data. Moreover, the deformation description of the new structural plane constitutive model is in good agreement with the experimental data, which is more suitable for simulating the deformation of high slope rock mass containing structural planes, and can truly reflect the valley deformation of the high arch dam reservoir area, ensuring the safe and stable operation of the high slope and dam in the reservoir area.</p>

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Research on Valley Deformation of High Arch Dam Based on Discontinuous Deformation Characteristics Analysis of Rock Mass Containing Structural Planes

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Xiang Yang,
  • Chao Jia,
  • Qingwen Ren,
  • Yinjun Gao,
  • Xuhua Ren,
  • Wenpeng Xie,
  • Zaitie Chen,
  • Yushang Gao

摘要

The phenomenon of valley (slope) shrinkage deformation that occurs during the initial stage of construction and water storage in the high arch dam reservoir area has the characteristics of large and irreversible deformation values. Due to the presence of numerous structural planes in the slope, it often manifests as discontinuous deformation characteristics, which affects the safety of the dam. To study the complex interaction between high slope rock mass and internal discontinuous structural planes, and their influence on the valley deformation of high arch dams, this article relies on the Jinping I High Arch Dam to analyze the discontinuous deformation behavior of high slope rock mass containing structural planes. This article introduces two discontinuous deformation characteristics analysis methods, one is the FEM–SPH coupling analysis method and the other is the Nonlinear Spring Element method. The FEM–SPH coupling analysis method considers the medium type of the structural plane itself and the transformation of boundary conditions, while the Nonlinear Spring Element method adopts the new structural plane constitutive model proposed in this article. The application of the constitutive relationship of structural planes at the interface between structural planes and rock mass was considered while conducting discontinuous deformation characteristics analysis. The results show that the simulation of valley deformation in Jinping I High Arch Dam shows that the deformation calculation results of the FEM–SPH coupling analysis method have not converged as a whole, while the deformation calculation results of the Nonlinear Spring Element method are close to the elastic–plastic Finite Element Method (FEM) and actual monitoring data. Moreover, the deformation description of the new structural plane constitutive model is in good agreement with the experimental data, which is more suitable for simulating the deformation of high slope rock mass containing structural planes, and can truly reflect the valley deformation of the high arch dam reservoir area, ensuring the safe and stable operation of the high slope and dam in the reservoir area.