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GEOE 430 > 2. Rock Geology and Excavation > Flashcards

2. Rock Geology and Excavation Flashcards

1
Q

4 Keys to Understanding a Rock Mass

A
  1. Rock mass
  2. Rock structure
  3. Stress
  4. Water
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2
Q

What does rock mass affect?

A
  • fragmentation
  • displacement
  • blast damage
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3
Q

How does rock porosity affect blasting?

A

large voids can store water + the larger the pores, the more energy lost during a blast

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4
Q

How does grain size affect blasting?

A

fine grain rocks may cause cuts to freeze

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5
Q

Why must rock mass conductivity be considered when designing a blast?

A

premature blasting may occur if the current can travel through the rock to the next drillhole

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6
Q

How might a rock mass containing sulfide or coal affect blasting?

A

can cause secondary explosions

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7
Q

Would mechanical boring or drill-blast be used for long straight tunnels in sed. rock?

A

mechanical boring

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8
Q

Would mechanical boring or drill-blast be used for long straight tunnels in igneous rock?

A

mechanical boring

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9
Q

Would mechanical boring or drill-blast be used for short curved tunnels in sed. rock?

A

drill-blast

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10
Q

Would mechanical boring or drill-blast be used for short curved tunnels in igneous rock?

A

drill-blast

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11
Q

What are 5 reasons to blast?

A
  1. fragmentation
  2. losseness
  3. movement
  4. minimum damage
  5. reduce over breakage
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12
Q

What are 5 types of surface blasting?

A
  1. bench
  2. throw/cast
  3. sinking cut
  4. wall control
  5. secondary
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13
Q

What are 5 types of underground blasting?

A
  1. raise
  2. bench
  3. ring
  4. shaft
  5. development
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14
Q

What are 8 implication of bad blasting?

A
  1. reduced excavation productivity
  2. secondary blasting
  3. reduced recovery
  4. increased waste volume
  5. increased airblast
  6. increased ground falls
  7. increased ground vibration
  8. increased dilution
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15
Q

What 4 things does fragmentation depend on?

A
  1. confinement
  2. coupling of charge with blasthole
  3. burden
  4. blast sequencing
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16
Q

Blastability Index

A

describes the ease of blasting; the higher the rating, the easier the rock mass is to blast

17
Q

What 5 parameters does the blastability index depend on?

A
  1. rock mass description
  2. joint spacing
  3. join orientation
  4. rock density
  5. rock strength
18
Q

How does confinement affect fragmentation?

A

lack of confinement results in loss of energy from blast hole

19
Q

What is the purpose of blast sequencing?

A

delays allow space for the rock to move into

GEOE 430 (12 decks)

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