Structure instability forecasting and analysis of giant rock pillars in steeply dipping thick coal seams

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• 作者：Xing-ping Lai ; Huan Sun ; Peng-fei Shan…
• 关键词：coal mining ; structural instability ; rock pillars ; forecasting ; acoustic emission (AE) ; steeply dipping coal beds
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：22
• 期：12
• 页码：1233-1244
• 全文大小：9,101 KB
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• 作者单位：Xing-ping Lai (1) (2)
  Huan Sun (1) (2)
  Peng-fei Shan (1) (2)
  Ming Cai (3)
  Jian-tao Cao (1) (2)
  Feng Cui (1) (2)
  
  1. Energy School, Xi’an University of Science and Technology, Xi’an, 710054, China
  2. Key Laboratory of Western Mines and Hazard Prevention (Ministry of Education of China), Xi’an, 710054, China
  3. Bharti School of Engineering, Laurentian University, Sudbury, Ontario, Canada
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

Structure stability analysis of rock masses is essential for forecasting catastrophic structure failure in coal seam mining. Steeply dipping thick coal seams (SDTCS) are common in the Urumqi coalfield, and some dynamical hazards such as roof collapse and mining- induced seismicity occur frequently in the coal mines. The cause of these events is mainly structure instability in giant rock pillars sandwiched between SDTCS. Developing methods to predict these events is important for safe mining in such a complex environment. This study focuses on understanding the structural mechanics model of a giant rock pillar and presents a viewpoint of the stability of a trend sphenoid fractured beam (TSFB). Some stability index parameters such as failure surface dips were measured, and most dips were observed to be between 46° and 51°. We used a digital panoramic borehole monitoring system to measure the TSFB’s height (ΔH), which varied from 56.37 to 60.50 m. Next, FLAC3D was used to model the distribution and evolution of vertical displacement in the giant rock pillars; the results confirmed the existence of a TSFB structure. Finally, we investigated the acoustic emission (AE) energy accumulation rate and observed that the rate commonly ranged from 20 to 40 kJ/min. The AE energy accumulation rate could be used to anticipate impeding seismic events related to structure failure. The results presented provide a useful approach for forecasting catastrophic events related to structure instability and for developing hazard prevention technology for mining in SDTCS. Keywords coal mining structural instability rock pillars forecasting acoustic emission (AE) steeply dipping coal beds