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<p>As the development of western China progress, numerous large-scale hydropower stations are being constructed in regions characterized by intricate geological condition and vulnerable ecological environment. This study focuses on the rock mass slope at the dam site of the Kala hydropower station as the subject of engineering research. Through a combination of field investigation, theoretical analysis, and numerical simulation, the formation process and stability of the rock mass are examined. The findings indicate that the particle flow method effectively simulates valley undercutting and dynamic response. Following valley undercutting, the maximum deformation is observed in the right bank slope, reaching up to 0.3&#xa0;m. A potential toppling-sliding instability model is identified on the left bank. Under seismic loading, a wedge with significant deformation appears on the right bank at 3.0s, while the deformation and displacement on the left bank slightly exceed those on the right. As seismic amplitude increases, micro-cracks propagate both laterally and vertically into the slope’s interior, leading to gradual instability. A notable basal rupture surface emerges under the influence of a high-density joint zone at an elevation of 2073&#xa0;m.</p>

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The formation process and stability analysis of dam site slope in Kala hydropower station through discrete element method

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Shiqi Liu,
  • Huanling Wang,
  • Zhichao Cheng,
  • Wei Li,
  • Feng Ji

摘要

As the development of western China progress, numerous large-scale hydropower stations are being constructed in regions characterized by intricate geological condition and vulnerable ecological environment. This study focuses on the rock mass slope at the dam site of the Kala hydropower station as the subject of engineering research. Through a combination of field investigation, theoretical analysis, and numerical simulation, the formation process and stability of the rock mass are examined. The findings indicate that the particle flow method effectively simulates valley undercutting and dynamic response. Following valley undercutting, the maximum deformation is observed in the right bank slope, reaching up to 0.3 m. A potential toppling-sliding instability model is identified on the left bank. Under seismic loading, a wedge with significant deformation appears on the right bank at 3.0s, while the deformation and displacement on the left bank slightly exceed those on the right. As seismic amplitude increases, micro-cracks propagate both laterally and vertically into the slope’s interior, leading to gradual instability. A notable basal rupture surface emerges under the influence of a high-density joint zone at an elevation of 2073 m.