Risk evaluation of rock burst through theory of static and dynamic stresses superposition

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• 作者：Zhen-lei Li ; Lin-ming Dou ; Gui-feng Wang …
• 关键词：rock burst ; hazard ; mining ; stress ; risk evaluation ; microseismic monitoring
• 刊名：Journal of Central South University of Technology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：22
• 期：2
• 页码：676-683
• 全文大小：1,543 KB
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  20. CAO An-ye, DOU
• 作者单位：Zhen-lei Li (1) (2)
  Lin-ming Dou (1) (2)
  Gui-feng Wang (1)
  Wu Cai (1) (2)
  Jiang He (2)
  Yan-lu Ding (1) (2)
  
  1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

Rock burst is one of the most catastrophic dynamic hazards in coal mining. A static and dynamic stresses superposition-based (SDSS-based) risk evaluation method of rock burst was proposed to pre-evaluate rock burst risk. Theoretical basis of this method is the stress criterion incurring rock burst and rock burst risk is evaluated according to the closeness degree of the total stress (due to the superposition of static stress in the coal and dynamic stress induced by tremors) with the critical stress. In addition, risk evaluation criterion of rock burst was established by defining the “Satisfaction Degree-of static stress. Furthermore, the method was used to pre-evaluate rock burst risk degree and prejudge endangered area of an insular longwall face in Nanshan Coal Mine in China. Results show that rock burst risk is moderate at advance extent of 97 m, strong at advance extent of 97-31 m, and extremely strong (i.e. inevitable to occur) when advance extent exceeds 131 m (mining is prohibited in this case). The section of two gateways whose floor abuts 15-3 coal seam is a susceptible area prone to rock burst. Evaluation results were further compared with rock bursts and tremors detected by microseismic monitoring. Comparison results indicate that evaluation results are consistent with microseismic monitoring, which proves the method’s feasibility.