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A Parametric Study of Blast Damage on Hard Rock Pillar Strength

Author

Listed:
  • Kashi Vishwanath Jessu

    (Western Australian School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia)

  • Anthony J. S. Spearing

    (Western Australian School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia)

  • Mostafa Sharifzadeh

    (Western Australian School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia)

Abstract

Pillar stability is an important factor for safe working and from an economic standpoint in underground mines. This paper discusses the effect of blast damage on the strength of hard rock pillars using numerical models through a parametric study. The results indicate that blast damage has a significant impact on the strength of pillars with larger width-to-height ( W / H ) ratios. The blast damage causes softening of the rock at the pillar boundaries leading to the yielding of the pillars in brittle fashion beyond the blast damage zones. The models show that the decrease in pillar strength as a consequence of blasting is inversely correlated with increasing pillar height at a constant W / H ratio. Inclined pillars are less susceptible to blast damage, and the damage on the inclined sides has a greater impact on pillar strength than on the normal sides. A methodology to analyze the blast damage on hard rock pillars using FLAC 3D is presented herein.

Suggested Citation

  • Kashi Vishwanath Jessu & Anthony J. S. Spearing & Mostafa Sharifzadeh, 2018. "A Parametric Study of Blast Damage on Hard Rock Pillar Strength," Energies, MDPI, vol. 11(7), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1901-:d:159100
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    Citations

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    Cited by:

    1. Mahdi Shadabfar & Cagri Gokdemir & Mingliang Zhou & Hadi Kordestani & Edmond V. Muho, 2020. "Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions," Energies, MDPI, vol. 14(1), pages 1-24, December.
    2. Krzysztof Skrzypkowski, 2020. "Decreasing Mining Losses for the Room and Pillar Method by Replacing the Inter-Room Pillars by the Construction of Wooden Cribs Filled with Waste Rocks," Energies, MDPI, vol. 13(14), pages 1-20, July.

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