The influence of geology on blast damage

Abstract The geological features of a rock mass have a direct influence on its blasting characteristics.
It has been observed that perimeter control techniques provide excellent results in massive crystalline formations but may give poor results in weak and or highly jointed formations.
A field study was conducted with the objective of understanding the role played by the geological features of a rock mass in producing and controlling blast damage. The field work involved the assessment of blast damage at several operating mines and the blasting of drift rounds in a geologically dominant rock mass.
The effect of rock strength, rock quality designation (RQD), joint parameters and hydrogeological
conditions on blast damage is described below. The influence of number and thickness of weak layers on blast damage is also discussed below on the basis of quantitative data. In addition, critical particle velocity ranges for damage to different rock types have also been outlined in this paper.
Keywords: KEYWORDS: Rock mass, Blast damage, Half cast factor, Blast vibration.
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Summary: The principal sources of dilution during underground evaluation and mining are discussed, then definitions of ore dilution currently in use are analyzed. These definitions vary depending on the authors. A new ore dilution evaluation methodology is proposed, replacing the ten different analytical expressions by only two: the planned dilution factor related to the stoping selectivity, done at the mine planning level, and the additional dilution factor related to the efficiency of the dilution...
Publication: CIM Bulletin
Author(s): S. Planeta
Keywords: Dilution, Exploitation souterraine, Dilution planifiŽe, Dilution additionelle, Dilution finale.
Issue: 1048
Volume: 94
Year: 2001
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