Application of preblasting to high-section top coal caving for steep-thick coal seam

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• 作者：Jian-hui Zhao (1)
  Xing-ping Lai (1) (2)
  
• 关键词：extra ; steep ; thick seam ; high ; section top ; coal caving (HSTCC) ; prefracture blasting and verification
• 刊名：Journal of Coal Science and Engineering (China)
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：17
• 期：2
• 页码：113-118
• 全文大小：749KB
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• 作者单位：Jian-hui Zhao (1)
  Xing-ping Lai (1) (2)
  
  1. School of Energy Engineering, Xi鈥檃n University of Science and Technology, Xi鈥檃n, 710054, China
  2. Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, Xi鈥檃n, 710054, China
  
• ISSN：1866-6566

文摘

For mining extra-steep-thick coal seam, the sublevel top coal caving is a high efficient method in practical engineering. However, major challenges associated with mining high-section top-coal-caving (HSTCC) are related to the resulting high ground stresses. Inevitability, using the high-section sublevel top coal caving for extra-steep-thick coal seam, the large scale of mined-out area appears. If the prefracture blasting and hydraulic fracture techniques are utilized, the top coal damage and cracks will develop, and the mining complexity will increase, such as seam inclination, continuity, mechanical characteristics of roof and susceptibility of top coal, etc. First, the field conditions of B1+2 seam were investigated at the +588 level of the Weihuliang Underground Mine of China. Subsequently, according to caving mechanism of strata response obtained from several special models including physical simulation tests and numerical simulation models, the prefracture process including blasting and injecting water were analyzed. Then, the prefracture blasting technique was successfully applied to the caving of 52 m-sublevel seam. Finally, the effects were verified by advanced detecting instruments, and the results show these methods and measurements are feasible and valid.