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<p>As a new type of underground water conservancy project, underground reservoirs in coal mines play a crucial role in protecting and utilizing water resources during mining operations. The safety and reliability of the dam body are key to this technology. Focusing on the basic situation of the Shendong 2–2 coal seam coal mine underground reservoir, this paper uses mechanical analysis, mechanical testing and other methods. From the perspective of the dam body stability under the combined effects of seismic activity and water immersion, this study analyzes the changes in the stability of the dam body during reservoir operation. It focuses on the dynamic impacts of earthquakes and mining-induced tremors, along with the long-term effects of water immersion. By comprehensively analyzing the changes in stress, displacement, and other parameters when the combined dam body (coal pillar + concrete) fails, the research identifies the locations and causes of damage to the dam body under the impact of earthquakes. It also proposes precursor information and characteristics of dam body instability under long-term water immersion and dynamic load effects. The results indicate that under water storage conditions (horizontal stress combined with water immersion), the coal pillar undergoes displacement and eventually becomes unstable, facturing upon reaching its limit strength. Water immersion reduces the mechanical strength of the coal pillar. For a coal pillar 15&#xa0;m thick, the maximum water storage height is 50&#xa0;m. It is recommended that displacement changes be used as precursor information for dam body monitoring and early warning during the actual water storage process. The “coal pillar–concrete” combined dam body can resist earthquakes of magnitude 10 and above (1.2&#xa0;g). During earthquakes, the bottom and middle parts of the dam are the main locations of stress concentration, with the stress change pattern being bottom &gt; middle &gt; top. Due to the difference in material properties between the concrete and coal pillar dam bodies, the difference in acceleration between the two during earthquakes is about 1.14 times, causing the bottom of the coal pillar to be the first to break. Additionally, the stress peak on the submerged side body during an earthquake is about 10% higher than that on the front. This research is important for the stability analysis and monitoring and early warning of underground reservoirs in coal mines and provides a reference for the stability of other underground projects.</p>

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Seismic performance analysis of a submerged “coal pillar–concrete” combined dam body under wet-dry cycles

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月22日

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  • Mingbo Chi,
  • Hongfei Duan,
  • Fei Xiong,
  • Shuai Zhang,
  • Honglin Liu,
  • Nanyun Wang,
  • Hongzhi Wang,
  • Xianwei Meng,
  • Jianchao Cheng

摘要

As a new type of underground water conservancy project, underground reservoirs in coal mines play a crucial role in protecting and utilizing water resources during mining operations. The safety and reliability of the dam body are key to this technology. Focusing on the basic situation of the Shendong 2–2 coal seam coal mine underground reservoir, this paper uses mechanical analysis, mechanical testing and other methods. From the perspective of the dam body stability under the combined effects of seismic activity and water immersion, this study analyzes the changes in the stability of the dam body during reservoir operation. It focuses on the dynamic impacts of earthquakes and mining-induced tremors, along with the long-term effects of water immersion. By comprehensively analyzing the changes in stress, displacement, and other parameters when the combined dam body (coal pillar + concrete) fails, the research identifies the locations and causes of damage to the dam body under the impact of earthquakes. It also proposes precursor information and characteristics of dam body instability under long-term water immersion and dynamic load effects. The results indicate that under water storage conditions (horizontal stress combined with water immersion), the coal pillar undergoes displacement and eventually becomes unstable, facturing upon reaching its limit strength. Water immersion reduces the mechanical strength of the coal pillar. For a coal pillar 15 m thick, the maximum water storage height is 50 m. It is recommended that displacement changes be used as precursor information for dam body monitoring and early warning during the actual water storage process. The “coal pillar–concrete” combined dam body can resist earthquakes of magnitude 10 and above (1.2 g). During earthquakes, the bottom and middle parts of the dam are the main locations of stress concentration, with the stress change pattern being bottom > middle > top. Due to the difference in material properties between the concrete and coal pillar dam bodies, the difference in acceleration between the two during earthquakes is about 1.14 times, causing the bottom of the coal pillar to be the first to break. Additionally, the stress peak on the submerged side body during an earthquake is about 10% higher than that on the front. This research is important for the stability analysis and monitoring and early warning of underground reservoirs in coal mines and provides a reference for the stability of other underground projects.