Journal of Mining & Safety Engineering ›› 2016, Vol. 33 ›› Issue (6): 1038-1044.

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Study on the breaking span and deformation of hard roof in Datong mining area

  

  • Received:2015-04-21 Online:2016-11-15 Published:2016-11-29

Abstract:   

Key words: hard roof, thick plate theory, strong or weak weighting, deformation, fracture