Seismic performance analysis of a submerged"coal pillar-concrete"combined dam body under wet-dry cycles
Mingbo Chi1
Hongfei Duan1
Fei Xiong2
Shuai Zhang3
Honglin Liu4
Nanyun Wang4
Hongzhi Wang5
Xianwei Meng6
Jianchao Cheng7
1.China Academy of Safety Science and Technology,Beijing 102209,China2.School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China3.Taiyuan University of Technology,Taiyuan 030002,China4.School of Civil Engineering,Chongqing University,Chongqing 400045,China5.Xinjiang University,Urumqi 719000,China6.Nenjiang Kunyuan Mining Co.,Ltd.,Heihe 161400,China7.School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
摘要：As a new type of underground water conservancy project,underground reservoirs in coal mines play a crucial role in pro-tecting 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 param-eters 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 condi-tions(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.
机标关键词：analysisbodycoalcombinedcyclesperformancepillar-concreteseismic
论文发表日期：2025-12-31
在线出版日期：2026-01-30（本平台首次上网日期，不代表文献的发表时间）
页数：16( 48-63 )
英文信息