exc test2 p2

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Author:
athoms
ID:
112120
Filename:
exc test2 p2
Updated:
2011-10-25 18:05:31
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exc test2
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exc test2 p2
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  1. Angle Driling
    Advantages - 6
    Disadvantages - 5
  2. Proper Energy Distribution can be achieved by: (4)
  3. Proper Energy Confinement can be achieved by: (6)
  4. Required Explosive Energy Level Depends On: (7)
  5. Purpose of sequential blasting:
    (7)
  6. Muckpile Displacement: 5
  7. Fragmentation:
  8. Overbreak Control
  9. Rock Structure
  10. Water Conditions
  11. Site Sensitvity
  12. The blasting fragmentation process
  13. Rock Mass Properties (4 + explanation)
  14. Rock Mass Structure: (5)
    • Bedding
    • Joints
    • Faults
    • Schistosity or Foliation
    • Contacts
  15. Problem Geologic Features (3)
    • Joints
    • Bedding
    • Mud or soft seams
  16. Problems with Joints: (5)
    • interruption of stress wave
    • premature borehole linking
    • venting of explosion gasses
    • air blast
    • poor fragmentation

    Joint spacing, orientation and persistance will control the size, the shape of fragments and of the excavation
  17. Blasting in bedded Rocks 6
    • Results are difficult to predict
    • different rock layers are intersected
    • burden and spacing the same for all rocks
    • rock layers respond differently
    • fragmentation will be different for each layer
    • floor conditions and backbreak will differ in various sections of the blast
  18. Mud or Soft Seams (4)
    • Energy Loss
    • Severe Violence
    • Poor fragmentation
    • Poor borehole stability

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