Mechanical model of fracture and damage of coal bump in the entry
HUANG Qing-xiang
GAO Zhao-ning
Abstract：The formation of thin coal shell that is formed by aerofoil cracks engendered at the tip of primary cracks in the entry′s surrounding coal is analysed.The coal bump will be caused by the bending and instability of thin coal shell.By use of Griffth energy theory and criterion of fracture mechanics, considering the damage accumulation before the crack expanding and make the crack spreadi ng coupling with the damage process, the critical stress of coal bump is determined, and the its influence factor is analyzed at last.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 156-159 )