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Title: Blasting-induced damage in coal

The paper is drawn from a project intended to explore a technique of prediction, control and optimization of fracture in coal induced by blasting. It evaluates the fines generated in coal submitted to dynamic loading stresses in an impact stamp mortar. The aim is to analyze a complex phenomenon of coal response to blast-generated stresses from a series of discrete simulations of shock and gas actions in controllable processes. It is learned that despite the nucleation of primary crushing and fractures to originate from the point of impact energy in coal, a secondary crushing appears to depart from within the burden progressing towards the free boundaries. The extension of the secondary crushing zone appears to be influenced by the magnitude of the breaking stresses generated and the coal burden distance. A strong dependence of fines on the coal`s innate discontinuities (strength) and the energy input is highlighted.
Authors:
 [1]
  1. Univ. of the Witwatersrand (South Africa)
Publication Date:
OSTI Identifier:
400808
Report Number(s):
CONF-950247-
TRN: IM9650%%214
Resource Type:
Conference
Resource Relation:
Conference: 21. annual conference on explosives and blasting techniques, Nashville, TN (United States), 5-9 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the twenty-first annual conference on explosives and blasting technique. Volume 1; PB: 371 p.
Publisher:
International Society of Explosives Engineers, Cleveland, OH (United States)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL SEAMS; EXPLOSIVE FRACTURING; FORMATION DAMAGE; COAL MINING; COAL FINES; SHOCK WAVES; STRESS ANALYSIS; PARTICLE SIZE; DISTRIBUTION