n Journal of Emerging Trends in Engineering and Applied Sciences - Fracture characterization : an effective technique for ensuring accurate blast design

Volume 2, Issue 6
  • ISSN : 2141-7016
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Almost all granite outcrops have natural fractures which influence their response to mechanical failure. This paper focuses on the use of AutoCADĀ© computer software model in characterizing the fractures of a granite outcrop at Johnson Constructions quarry, Akure, Ondo State. The fractures were mapped. The results were used to determine the in situ block-size distribution of the outcrop. They indicated irregular block size distributions which were set with average surface area of in situ blocks sizes ranges of 0.01-1.50m2, 1.51-4.00m2, 4.01-8.00m2, 8.01-12.00m2, 12.01-16.00m2, 16.01-24.00m2 and 24.01-32.00m2 respectively. It was recommended that the region with average surface area of in situ block of range 0.01-1.50m2 should be charged with 50% of the current high charge in use, for range of 1.5-4.00m2, 60%, for range of 4.01-8.00, 80% and 100% for ranges above 8.00m2.

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