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

作者：Mingbo Chi, Hongfei Duan, Fei Xiong, Shuai Zhang, Honglin Liu, Nanyun Wang, Hongzhi Wang, Xianwei Meng, Jianchao Cheng · 发表于：International Journal of Coal Science & Technology · 年份：2025 · DOI：10.1007/s40789-025-00816-y · 被引用次数：9 · 研究领域：Dam Engineering and Safety、Geotechnical Engineering and Underground Structures、Seismic Performance and Analysis

Abstract 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 ...